Do you know what stage of the boot is failing?
Does it get past GRUB and boot the kernel? If not, you probably need to update your board firmware version (specifically U-Boot).
The older 2020.X U-Boot’s that we shipped on launch simply don’t work with more recent GRUB’s and kernels. You can try the “v0.9.1” testing version or the more recent development version. I’m planning to do a new formal release in July or August.
Besides that, Debian 13 (trixie) works fine by itself. I can’t recall the details 100%, but I did run into issues doing upgrades from 12 to 13.