Missing instructions on how to upgrade TF-A/U-Boot to newer versions.

[hrw]

I installed OpenWRT on E8450 in 2021. Used installer 0.5.3 (looking at TF-A 2.4 + U-Boot 2021.04 versions).

Device refuses to upgrade from 23.05.2 -> 23.05.3 and I started to wonder do I need to update bootloaders.

But your docs say "vendor FW -> OpenWRT" and vice-versa only.

Please add instructions on how to update bootloaders.