Some notes on getting Debian 10 (stable) installed and running on the Beelink U57 Mini PC with Intel Core i5-5257u Processor.
Create a bootable USB Flash drive of the Debian 10 netinst ISO using Etcher.
- Download ISO from Debian: https://www.debian.org/distrib/netinst
- Flash to SD Card using Balena Etcher https://www.balena.io/etcher/
- Connect ethernet cable to Beelink
Note: The firmware needed to use the Beelink's onboard Intel Wifi is proprietary, and is not included with the default install of Debian. If you don't have the option of a wired LAN connection you can use an "unofficial" Debian CD image, that includes the proprietary (non-free) firmware. (https://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/) See the below section on installing the firmware later on.
- Immediately after startup press the
Delkey to enter the BIOS.