ROCK 5T not booting after OS update – unable to enter Maskrom or use UART

Hello,

I purchased a ROCK 5T four days ago and had been using it normally with Armbian installed. However, after performing an OS update and testing it with the Radxa Display 8 HD, the device stopped booting.

Currently:

Unable to enter Maskrom mode
GPIO UART-to-TTL communication is not working
No visible signs of boot activity

As a result, the board is completely unusable.

Is there any last-resort recovery method I can try to restore the device?
Any guidance or suggestions would be greatly appreciated.

Thank you.

Please test with our system: Installing the system | Radxa Docs