alsg wrote I don't see why not given that both hardware are basically identical. There may be a need to "downgrade" the u-boot on the v3 router to v2 before flashing to your own custom firmware. How...

I have been googling it before I wrote here, but I did not find exactly what I need. The only answer I found (OpenWRT forum) is that v2 boot sector has size 128 KiB, but I can not found size of v3...

How do you know, how many bytes are needed to stripp out? Has the boot size sector same size at v2 and v3?