is this method really working? there is no need to copy all files as i mentioned earlier?
i'm asking because i tried flashing in almost that way.
chose dead phone flashing. then options and changed rofs2, rofs3 and core. (didn't renamed anything or smth else and got dead phone.
Yes it absolurely works . There ia no way you can downgrade without killing your phone so the only option is to use the same core (of your current fw version) and renaming the rofs which you want to use to match the name of rofs qhich you are currently using.
And if you are usong a modded rofs rofs then rofs calibration has to be done as i said before to disable hash checking