At Radxa's suggestion I grabbed their latest image `rock-5t_bookworm_kde_r5.output_512.img` which contains `DDR b8ce94f14b cym 25/09/26-15:48.05,fwver: v1.20` and `stress-ng` now passes without any errors.

Does the box have an sd card slot and have you tried booting from that? (That is the common method). Also are you sure the box has an s905x3? Have you opened the box and inspected the chip? You might want to try all the uboot binaries just in case.

Thanks. URL is https://paste.armbian.com/liqeyelovi

I am trying to boot from a USB stick, but it shows the error you can see in the screenshot. I am using the update button on the back of the TV box. It does start the boot process from the USB, but according to the error message it seems unable to actually read the drive. I have been stuck on this issue for several days now.

The s905x3 one. Also, how are you booting this? You say it doesn't recognize usb, so what are you using to boot Armbian?