Updated stock Manjaro, now won't boot (brick?)

[wdt]

There may be a readme in boot telling the dd commands to write idbloader and u-boot.itb
If it is mainline (likely) trust is part of (contained in) u-boot.itb
uboot may be considered as a rudimentary bios
The dtb might be considered the 2nd half of the bios, to set up the specific devices
The dtb will have been updated with a new kernel, maybe there is some mismatch between the two (uboot & dtb)