Digisol DG-GR6011 GPON ONT Complete Guide

PON Serial Number Change, Linux Shell Access & Flash Command Reference

Device Overview

What is DG-GR6011?

The Digisol DG-GR6011 is a GPON (Gigabit Passive Optical Network) ONT (Optical Network Terminal) router designed for fiber-to-the-home (FTTH) deployments.

Key Features:

GPON interface with auto-sensing
Gigabit Ethernet ports
VoIP capability
CATV RF overlay support
TR-069 remote management

Typical Use Cases:

ISP fiber broadband connections
FTTH residential deployments
Triple-play services (Internet + Voice + TV)

Technical Specifications

Hardware Specifications

Component	Specification
Device Model	DG-GR6011
Chipset	Realtek RTK9607C
CPU	MIPS interAptiv V2.0 (Dual Core)
CPU Speed	~700 MHz (BogoMIPS: 697.95)
Architecture	MIPS 32-bit, Big Endian
RAM	128 MB
Flash Memory	16 MB
GPON	Class B+/C+
Ethernet Ports	1x Gigabit LAN + 1x GPON WAN
VoIP	1x FXS ports
USB	1x USB 2.0 (model dependent)

Software Information

Component	Details
Operating System	Linux (embedded)
Kernel Version	4.4.140
Build System	gcc 4.8.5 (Realtek MSDK)
Shell	BusyBox v1.x
Filesystem	SquashFS (root), JFFS2 (config)
Web Server	BOA HTTP Server
Management	OMCI (ONT Management Control Interface)
Remote Mgmt	TR-069 (CWMP)

Flash Memory Layout

MTD Partitions:
┌──────────────┬──────────┬─────────────────┐
│ Partition    │ Size     │ Purpose         │
├──────────────┼──────────┼─────────────────┤
│ boot         │ 160 KB   │ Bootloader      │
│ env          │ 8 KB     │ Environment 1   │
│ env2         │ 8 KB     │ Environment 2   │
│ config       │ 848 KB   │ Configuration   │
│ kernel       │ 2560 KB  │ Linux Kernel    │
│ rootfs       │ 6 MB     │ Root Filesystem │
│ rootfs2      │ 6 MB     │ Backup RootFS   │
│ custconf     │ 512 KB   │ Custom Config   │
└──────────────┴──────────┴─────────────────┘

Network Configuration

Default Settings:

LAN IP: 192.168.1.1 (may vary by firmware)
Subnet Mask: 255.255.255.0
DHCP Server: Enabled (pool: .2 to .254)
Default Gateway: Self (LAN interface)
DNS: Relay mode (forwards to WAN DNS)

Interfaces:

eth0 - Physical Ethernet switch
eth0.X - VLAN interfaces
nas0_X - WAN interfaces (PPPoE/IPoE)
br0 - Bridge interface (LAN)

Quick Start Guide

TL;DR - Change PON Serial in 2 Minutes

# 1. Connect via telnet
telnet <device_ip>
login: <username>
password: <password>

# 2. Enter Linux shell (THE KEY COMMAND!)
> enterlinuxshell

# 3. Set new PON vendor ID
# flash set PON_VENDOR_ID HWTC

# 4. Set new serial number
# flash set GPON_SN HWTC87654321

# 5. Verify changes
# flash get PON_VENDOR_ID
# flash get GPON_SN

# 6. Reboot
# reboot

# 7. Wait 2-3 minutes, reconnect, verify:
> show deviceinfo

Prerequisites

What You Need

Access Requirements:

Admin username and password
Telnet client (available on Windows/Mac/Linux)
Network access to device (LAN connection)

Information to Gather:

Current PON vendor ID and serial number
Target PON vendor ID (from new ISP)
Target serial number (from ISP or old device)
Optional: PLOAM password (if required by ISP)

Finding Current PON Information

Method 1: Physical Label

Check sticker on bottom/back of device
Look for "S/N" or "PON SN"
Format: ABCD12345678 (4 letters + 8 digits)

Method 2: Web Interface

Open browser: http://<device_ip>
Login with admin credentials
Navigate to: Status → Device Info
Note "PON Serial Number"

Method 3: Telnet CLI

telnet <device_ip>
> show deviceinfo
# Look for "PON serial no." line

Common PON Vendor IDs

Vendor ID	Manufacturer
`HWTC`	Huawei Technologies
`ALCL`	Alcatel-Lucent / Nokia
`ZTEG`	ZTE
`ZYOT`	Zyxel
`GPON`	Generic GPON ONU
`BDCM`	Broadcom

Change PON Serial Number

Step 1: Enable Telnet

Via Web Interface:

Open browser and navigate to router IP
Login with admin credentials
Go to: Security → Login Privilege (or Remote Access)
Enable: Telnet on LAN
Optional: Set firewall to Low (if flash commands blocked)
Click Apply / Save

Verify telnet is enabled:

telnet <device_ip>
# Should prompt for login, not "Connection refused"

Step 2: Connect via Telnet

Open terminal/command prompt:

telnet <device_ip>

Login:

DG-GR6011 login: <username>
Password: ********

>

Verify connection:

> show deviceinfo

Step 3: Enter Linux Shell

This is the critical command that unlocks everything:

> enterlinuxshell

Expected output:

You are now in the BusyBox Linux shell with full system access!

Note: If enterlinuxshell doesn't work:

Try: sh, shell, /bin/sh, bash
Check if "Login Privilege" needs enabling in web GUI
Your firmware version may not support this

Step 4: Modify PON Serial

Set PON Vendor ID:

# flash set PON_VENDOR_ID HWTC

Set GPON Serial Number:

# flash set GPON_SN HWTC87654321

Serial Number Format:

Total: 12 characters
First 4: Vendor ID (uppercase letters)
Last 8: Unique identifier (alphanumeric)
Example: HWTC87654321, ALCL12345ABC

Step 5: Verify & Reboot

Verify changes:

# flash get PON_VENDOR_ID
PON_VENDOR_ID=HWTC

# flash get GPON_SN
GPON_SN=HWTC87654321

Reboot device:

# reboot

Final verification after reboot:

telnet <device_ip>
> show deviceinfo

# Look for:
PON vendor id         : HWTC
PON serial no.        : HWTC87654321

Flash Command Reference

The flash command is a utility for managing MIB (Management Information Base) configuration data stored in flash memory.

Flash Command Syntax

flash <command> [arguments]

Information Commands

Command	Description	Example
`info`	Show flash offset information	`flash info`
`list [cs\|hs\|all] [sorted]`	List MIB parameters (optionally sorted)	`flash list cs sorted`
`all [cs\|hs]`	Dump all flash parameters	`flash all cs`
`all_def [cs\|hs]`	Dump all MIB default values	`flash all_def cs`

Read Commands

Command	Description	Example
`get <MIB-NAME>`	Get specific MIB table entry	`flash get NTP_ENABLED`
`get <MIB-CHAIN>.NUM`	Get MIB chain record count	`flash get ATM_VC_TBL.NUM`
`get <MIB-CHAIN>`	Get all records from a MIB chain	`flash get ATM_VC_TBL`
`get <MIB-CHAIN>.<index>.<member>`	Get specific member of chain record	`flash get ATM_VC_TBL.0.ifIndex`
`get_def <MIB-NAME>`	Get default value of specific MIB	`flash get_def NTP_ENABLED`
`get_def <MIB-CHAIN>`	Get default value of MIB chain	`flash get_def ATM_VC_TBL`
`get_def <MIB-CHAIN>.NUM`	Get default record count	`flash get_def ATM_VC_TBL.NUM`
`get_def <MIB-CHAIN>.<index>.<member>`	Get default value of chain member	`flash get_def ATM_VC_TBL.0.ifIndex`
`r <OFFSET>`	Read flash from specific offset	`flash r 0x1000`

Write Commands

Command	Description	Example
`set <MIB-NAME> <VALUE>`	Set specific MIB table entry	`flash set NTP_ENABLED 0`
`set <MIB-CHAIN>.<index>.<member> <VALUE>`	Set specific member of chain record	`flash set ATM_VC_TBL.1.vpi 8`
`add <MIB-CHAIN>`	Add a new MIB chain record	`flash add ATM_VC_TBL`
`add <MIB-CHAIN>.<count>`	Add multiple MIB chain records	`flash add ATM_VC_TBL.2`
`del <MIB-CHAIN>`	Delete the last MIB chain record	`flash del ATM_VC_TBL`
`del <MIB-CHAIN>.<index>`	Delete specific MIB chain record	`flash del ATM_VC_TBL.2`
`w <OFFSET> <VALUE>`	Write value to specific flash offset	`flash w 0x1000 0xFF`

System Commands

Command	Description	Example
`default <cs/hs>`	Write program default values to flash	`flash default cs`
`clear`	Clear all flash settings	`flash clear`
`erase <OFFSET>`	Erase flash from specific offset	`flash erase 0x1000`
`voip`	VoIP settings management	`flash voip`
`loop`	Enter infinite loop (debugging)	`flash loop`

Common Flash Variables

PON/GPON Configuration

# PON Vendor ID (4 characters, uppercase)
flash get PON_VENDOR_ID
flash set PON_VENDOR_ID HWTC

# GPON Serial Number (12 characters)
flash get GPON_SN
flash set GPON_SN HWTC87654321

# GPON PLOAM Password (if required by ISP)
flash get GPON_PLOAM_PASSWD
flash set GPON_PLOAM_PASSWD 0123456789AB

# GPON ONU Model identifier
flash get GPON_ONU_MODEL

Hardware Configuration

# Hardware version
flash get HW_HWVER

# WAN MAC address
flash get HW_NIC0_ADDR
flash set HW_NIC0_ADDR 00:11:22:33:44:55

# LAN MAC address
flash get HW_NIC1_ADDR

# WLAN MAC address
flash get HW_WLAN_ADDR

Network Settings

# LAN IP address
flash get LAN_IP_ADDR
flash set LAN_IP_ADDR 192.168.1.1

# LAN subnet mask
flash get LAN_SUBNET

# DHCP server enable/disable
flash get LAN_DHCP

# DNS servers
flash get DNS1
flash get DNS2
flash get DNS3

MIB Tables Reference

Parameter Types

CS (Current Settings)

Configuration parameters that can be modified by the user:

Network settings (IP addresses, DHCP, DNS)
Security settings (firewall, ACL)
Service configurations (NTP, CWMP/TR-069)
WLAN settings

HS (Hardware Settings)

Hardware-specific parameters typically set at factory:

MAC addresses
TX power settings
RF calibration data
Serial numbers
Country codes

Common MIB Tables (CS)

ID	Name	Description
1	LAN_IP_ADDR	LAN interface IP address
2	LAN_SUBNET	LAN subnet mask
5	LAN_DHCP	DHCP server enable/disable
20	DNS_MODE	DNS mode configuration
21-23	DNS1, DNS2, DNS3	DNS server addresses
49	DMZ_ENABLE	DMZ feature enable
50	DMZ_IP	DMZ host IP address
126	NTP_ENABLED	NTP client enable
140	UPNP	UPnP enable/disable
142	ENABLE_QOS	QoS enable/disable
159	SYSLOG	Syslog enable/disable
337	LOID	Logical ONU ID
462	MIB_TELNET_ENABLE	Telnet service enable

Common MIB Chains (CS)

ID	Name	Description
3001	IP_PORT_FILTER_TBL	IP port filtering rules
3002	MAC_FILTER_TBL	MAC address filtering rules
3003	PORT_FW_TBL	Port forwarding rules
3004	ATM_VC_TBL	ATM Virtual Circuit configuration
3007	IP_ROUTE_TBL	Static IP routing table
3008	ACL_IP_TBL	Access Control List IP entries
3011	ACC_TBL	Account/user table
3014	IP_QOS_TBL	QoS configuration table
3029	URL_FQDN_TBL	URL filtering by FQDN
3063	PORT_BINDING_TBL	Port binding configuration
3105	VOIP_TBL	VoIP configuration

Hardware Settings (HS)

ID	Name	Description
2002	ELAN_MAC_ADDR	Ethernet LAN MAC address
2003	WLAN_MAC_ADDR	Wireless LAN MAC address
2025	HW_SERIAL_NO	Hardware serial number
2027	HW_CTEI_NO	CTEI number
2028	HW_CMEI_NO	CMEI number
2099-2100	HW_WLANx_COUNTRYCODE	WLAN country code
2033-2051	HW_WLANx_TX_POWER_*	TX power calibration

CWMP/TR-069 Settings

ID	Name	Description
4002	CWMP_ACS_URL	ACS server URL
4004	CWMP_ACS_USERNAME	ACS authentication username
4005	CWMP_ACS_PASSWORD	ACS authentication password
4006	CWMP_INFORM_ENABLE	Enable periodic inform
4009	CWMP_INFORM_INTERVAL	Inform interval (seconds)
4011	CWMP_CONREQ_USERNAME	Connection request username
4012	CWMP_CONREQ_PASSWORD	Connection request password
4019	CWMP_CONREQ_PORT	Connection request port
4021	CWMP_WAN_INTERFACE	WAN interface for CWMP

Security and Access Control

ID	Name	Description
44	IPF_OUT_ACTION	IP filter outbound default action
45	IPF_IN_ACTION	IP filter inbound default action
46	MACF_OUT_ACTION	MAC filter outbound default action
47	MACF_IN_ACTION	MAC filter inbound default action
96	SPC_ENABLED	SPC (Service Protection Control) enable
98	ACL_CAPABILITY	ACL capability enable
179	DOS_ENABLED	DoS protection enable
425	FW_ENABLE	Firewall enable
426	FW_GRADE	Firewall security level

QoS Settings

ID	Name	Description
142	ENABLE_QOS	Enable QoS
144	QOS_UPRATE	Upstream QoS rate
145	QOS_POLICY	QoS policy type
146	TOTAL_BANDWIDTH	Total bandwidth limit
148	QOS_MODE	QoS mode
152	IP_QOS_QUEUE_NUM	Number of QoS queues

Linux Shell Capabilities

After entering enterlinuxshell, you have access to a complete BusyBox Linux environment.

System Commands

# Kernel and system info
uname -a
cat /proc/version
cat /proc/cpuinfo

# Memory information
cat /proc/meminfo
free

# Mounted filesystems
mount

# Disk usage
df

# List all processes
ps
ps aux

# View system log
dmesg
logread

Network Tools

# Network interfaces
ifconfig
ifconfig -a

# Routing table
route -n

# ARP table
arp -a

# Network statistics
netstat -an
netstat -tulpn

# Firewall rules
iptables -L -n

# Bridge status
brctl show

# Ping
ping <ip>

File Operations

# List files
ls -la

# View file contents
cat <file>

# Search in files
grep "pattern" <file>
grep -r "pattern" /path/

# Find files
find / -name "filename"

CLI Command Reference

Before entering enterlinuxshell, the device has a restricted CLI with specific commands.

Show Commands

# Device information (includes PON serial)
show deviceinfo

# System status
show status

# Network interfaces
show interface

# DHCP settings and clients
show dhcp

# Routing table
show route

# ARP table
show arp

# Bridge settings
show bridge

# Firewall rules
show ipportfilter
show macfilter

# Port forwarding
show portforward

# Remote access settings
show remoteaccess

# WAN configuration
show wan

# LAN configuration
show lan

# TR-069 settings
show tr069

Config Commands

# Save configuration to flash
config save

# Factory reset
config reset

# DHCP configuration
config dhcp mode {none|relay|server}
config dhcp server poolstart <ip> poolend <ip>

# LAN configuration
config lan ip <ip> mask <netmask>

# Firewall
config ipportfilter default incoming {allow|deny} outgoing {allow|deny}

# Port forwarding
config portforward add protocol <tcp|udp|both> localip <ip> localport <port>

# Remote access
config remoteaccess telnet lan {allow|deny} wan {allow|deny}
config remoteaccess http lan {allow|deny} wan {allow|deny}

System Commands

# Reboot device
reboot

# Backup configuration via TFTP
backup tftp <server_ip> <filename>

# Restore configuration via TFTP
restore tftp <server_ip> <filename>

# Display help
help

# Exit telnet session
exit

Usage Examples

View Current LAN Configuration

flash get LAN_IP_ADDR
flash get LAN_SUBNET
flash get LAN_DHCP

Enable/Disable Services

# Enable NTP
flash set NTP_ENABLED 1

# Disable Telnet
flash set MIB_TELNET_ENABLE 0

# Enable UPNP
flash set UPNP 1

Clone PON Serial from Another Device

# Read from old device:
# flash get PON_VENDOR_ID
# flash get GPON_SN

# Write to new device:
# flash set PON_VENDOR_ID ALCL
# flash set GPON_SN ALCL12345678
# reboot

Change MAC Address

# Check current WAN MAC
# flash get HW_NIC0_ADDR

# Set new MAC
# flash set HW_NIC0_ADDR 00:11:22:33:44:55

# Reboot for changes to take effect
# reboot

Backup Flash Variables

# Save all variables to file
# flash all cs > /tmp/flash_backup.txt

Reset to Factory Defaults

# Reset current settings to default
flash default cs

# Reset hardware settings to default
flash default hs

MIB Chain Structure

MIB chains are arrays of configuration records using this addressing format:

<CHAIN_NAME>.<INDEX>.<MEMBER>

CHAIN_NAME: Name of the MIB chain (e.g., ATM_VC_TBL)
INDEX: Zero-based record index
MEMBER: Field name within the record

Example: ATM_VC_TBL.0.vpi refers to the VPI field of the first ATM VC entry.

Troubleshooting Guide

Issue 1: `enterlinuxshell` Command Not Found

Symptoms:

> enterlinuxshell
command error!

Solutions:

Try alternative commands:
```
> sh
> shell
> /bin/sh
```
Enable in web GUI:
- Go to: Security → Login Privilege
- Enable: "Advanced" or "Engineer" mode
- Save and reconnect
Check firmware version:
- Older firmware may not support this
- Update to latest firmware
Firewall blocking:
- Security → Firewall → Set to Low
- Security → Remote Access → Enable Telnet LAN

Issue 2: Flash Commands Give Errors

Solutions:

Ensure you're in shell:
- Prompt should be # or $, not >
- Run enterlinuxshell first
Check variable name:
- Variable names are case-sensitive
- Try: flash all | grep -i gpon

Issue 3: Changes Don't Persist After Reboot

Solutions:

Verify flash write before reboot:
```
# flash get GPON_SN
```
Ensure proper reboot:
```
# reboot
```
- Don't power off abruptly
Try explicit save:
```
# sync
# reboot
```

Issue 4: Device Won't Register with ISP

Checklist:

Serial format correct? (12 characters: XXXX12345678)
Vendor ID matches ISP's OLT?
PLOAM password required?
MAC address needs changing?
VLAN configuration correct?
Serial already registered with ISP?

Frequently Asked Questions

Q1: What if I don't know what PON serial to use?

Contact your ISP and ask for:

PON Vendor ID (4 characters)
Required serial number format
Any additional authentication (PLOAM password)
Whether serial needs pre-registration

Q2: Can I use any serial number I want?

No. The serial must:

Match your ISP's OLT configuration
Be unique on the PON network
Follow proper format (vendor ID + identifier)
May need ISP pre-registration

Q3: What's the difference between PON_VENDOR_ID and GPON_SN?

PON_VENDOR_ID: Just the 4-letter code (e.g., HWTC)
GPON_SN: Full serial including vendor (e.g., HWTC87654321)

Set both to be safe.

Q4: Do I need to change MAC address too?

Depends on ISP:

Most ISPs: Serial number only
Some ISPs: Serial + MAC address
Ask your ISP if MAC binding is used

Q5: Can I revert to original serial?

Yes! Just repeat the process with original values.

Always note down original values before changing:

> show deviceinfo

Q6: Can I brick my device doing this?

Very low risk if you:

Only change PON serial variables
Don't modify other flash variables
Verify changes before rebooting
Keep record of original values

Recovery: Factory reset button (10-30 seconds) if needed.

Important Notes

Caution: Modifying flash settings directly can render the device inoperable. Always backup settings before making changes.
Persistence: Changes made with flash set are written directly to flash memory and persist across reboots.
Service Restart: Some settings require a service restart or device reboot to take effect.
Raw Access: The r, w, and erase commands provide raw flash access and should only be used by advanced users.
Factory Reset: Use flash default cs to reset user configuration while preserving hardware calibration data.

Security Considerations

Access Control

The enterlinuxshell command provides root-level access!

Implications:

Full read/write filesystem access
Can modify any configuration
Can view all system files
Can monitor network traffic

Protect your device:

Use strong admin password

Disable WAN telnet:

> config remoteaccess telnet lan allow wan deny
> config save

Enable firewall
Monitor access regularly

Backup Before Changes

Always backup before modifications:

# Via telnet CLI
> show deviceinfo
> backup tftp <server_ip> backup.cfg

# Via shell
# flash all cs > /tmp/flash_backup.txt

Legal Notice

Important Legal Information

This guide is provided for educational and legitimate network administration purposes only.

Permitted Uses

You MAY use this guide to:

Migrate your service to a new ISP
Replace a failed ONT with a backup unit
Configure your own equipment on your own network
Learn about GPON technology and Linux systems
Perform authorized network testing

Prohibited Uses

You MUST NOT:

Clone serial numbers to steal broadband service
Access ISP networks without authorization
Bypass ISP equipment restrictions without permission
Modify serial numbers for fraudulent purposes

Legal Consequences

Unauthorized network access and service theft are crimes in most jurisdictions and may result in:

Criminal prosecution
Civil liability
Service termination
Financial penalties

ISP Terms of Service

Before making changes:

Read your ISP's terms of service
Contact ISP for authorization if unsure
Document any permissions received

Disclaimer

No Warranty

This information is provided "AS IS" without warranty of any kind.

Use At Your Own Risk

You accept full responsibility for:

Verifying information accuracy
Understanding procedures before executing
Backing up configurations
Ensuring legal compliance
Consequences of any changes made

Warranty Void

Modifying device configuration may:

Void manufacturer warranty
Void ISP service agreement
Prevent official support

Configuration Files Reference

Important Paths

System Configuration:

/etc/config/config.xml          - Main configuration
/etc/config/config_bak.xml      - Backup configuration
/etc/config/config_hs.xml       - Hardware settings
/var/config/                    - Runtime configuration

OMCI Configuration:

/etc/config/omci_mib.cfg            - OMCI MIB database
/etc/config/omci_custom_opt.conf    - OMCI custom options

System Files:

/etc/passwd                     - User accounts
/proc/cmdline                   - Kernel boot parameters
/proc/cpuinfo                   - CPU information
/proc/meminfo                   - Memory information

Available BusyBox Commands

File Management: ls, cd, pwd, mkdir, rmdir, rm, cp, mv, cat, more, head, tail, find, grep, awk, sed, sort, uniq, wc, cut

System Tools: ps, top, kill, killall, free, df, mount, umount, sync, dmesg, date, reboot

Network Tools: ifconfig, route, arp, ping, traceroute, netstat, telnet, tftp, wget

Archive Tools: tar, gzip, gunzip

This document combines device-specific flash command reference with general GPON ONT configuration guidance.

ankurpandeyvns/DG-GR6011_GPON_Guide.md

Digisol DG-GR6011 GPON ONT Complete Guide

Table of Contents

Quick Navigation

Main Procedures

Flash Command Reference

Advanced Topics

Help & Reference

Device Overview

What is DG-GR6011?

Technical Specifications

Hardware Specifications

Software Information

Flash Memory Layout

Network Configuration

Quick Start Guide

TL;DR - Change PON Serial in 2 Minutes

Prerequisites

What You Need

Finding Current PON Information

Common PON Vendor IDs

Change PON Serial Number

Step 1: Enable Telnet

Step 2: Connect via Telnet

Step 3: Enter Linux Shell

Step 4: Modify PON Serial

Step 5: Verify & Reboot

Flash Command Reference

Flash Command Syntax

Information Commands

Read Commands

Write Commands

System Commands

Common Flash Variables

PON/GPON Configuration

Hardware Configuration

Network Settings

MIB Tables Reference

Parameter Types

CS (Current Settings)

HS (Hardware Settings)

Common MIB Tables (CS)

Common MIB Chains (CS)

Hardware Settings (HS)

CWMP/TR-069 Settings

Security and Access Control

QoS Settings

Linux Shell Capabilities

System Commands

Network Tools

File Operations

CLI Command Reference

Show Commands

Config Commands

System Commands

Usage Examples

View Current LAN Configuration

Enable/Disable Services

Clone PON Serial from Another Device

Change MAC Address

Backup Flash Variables

Reset to Factory Defaults

MIB Chain Structure

Troubleshooting Guide

Issue 1: enterlinuxshell Command Not Found

Issue 2: Flash Commands Give Errors

Issue 3: Changes Don't Persist After Reboot

Issue 4: Device Won't Register with ISP

Frequently Asked Questions

Q1: What if I don't know what PON serial to use?

Q2: Can I use any serial number I want?

Q3: What's the difference between PON_VENDOR_ID and GPON_SN?

Q4: Do I need to change MAC address too?

Q5: Can I revert to original serial?

Q6: Can I brick my device doing this?

Important Notes

Security Considerations

Access Control

Backup Before Changes

Legal Notice

Issue 1: `enterlinuxshell` Command Not Found