Default [Q] [xt907] Going back to a older OTA?

My good friend wants to flash roms with his new phone but being na´ve updated the ota.
after reading up on ota 98.30.1 it seems its unrootable

so I ask you kind forum

Can rsd lite be used to download and install an older ota?

as a rom flasher my self I do know quite a lot about this but I want to be 100% sure this will work due to the possibility of failure

also he has been upset as of late and I was hoping this would cheer him up