I bought my Samsung ATIV 500T back in 2013 in Paris. It was preinstalled with Windows 8 Home. I soon upgraded it to Windows 8 Professional to be a part of the work domain. And later to Windows 8.1 and later to Windows 10.
I am still very happy with it and it's pen-OneNote combination is still bringing a lot of surprise to whoever is near.
Once I incidentally tryied to install SQL Express to it and it was very bad decision. I create a Windows Restore Point before so it was quite easy to roll back.
But few days ago I tried to do the factory Reset and ended up with unbootable device. There seems to be no "Boot from USB" so I have had to come with another idea.
To keep it simple:
- prepare a USB stick with Windows 8 32-bit first (the original operating system for Samsung ATIV 500T)
- turn 500T off
- stick the USB in
- Hold Volume Up + Power
- Keep Volume Up hold until you see "Wait..."
- Note there is no "Use a Device", but you can go to "Advanced"
- Run "Start command prompt"
- find the USB stick (it was
D:for me) - run the Windows installer
D:\setup.exe - Install Windows 8
- Update your drivers (hope you saved them first when you bought your 500T)
- remove the USB stick
- put Windows 10 32-bit on the USB stick
- run upgrade to Windows 10 from Windows 8
- enjoy

f you still have access to windows 8 follow option 1, if not option two.
option 1:
On systems with Windows 8 pre-installed, you can access the UEFI (BIOS) setup screens from the Windows 8 boot menu:
1.Press the Windows (Image) key + C, or swipe in from the right edge of the screen to open your Charms.
2.Click Settings.
3.Click Change PC Settings.
4.In PC Settings, select General.
5.Under Advanced startup, click Restart now. The system will restart and show the Windows 8 boot menu.
6.In the boot menu, select Troubleshoot.
7.In the Troubleshoot menu, select Advanced options.
8.In the Advanced options menu, select UEFI Firmware Settings.
9.Click Restart to restart the system and enter UEFI (BIOS).
option 2:
You have to change this default method of booting by going into the BIOS setup. You do this by putting the thumb drive into the USB socket, Then by pressing the F2 key during the booting process. You will come to a screen where you see the heading Samsung BIOS Configuration. Below this there are several options on the left hand side.
1.Select " Advanced" and change the Fast BIOS Mode to OFF. This is a necessary condition for the system to boot from the USB.
2.Then select "Boot", and in that, change the Secure Boot to OFF