when you use the FUN Mode to Flash the NOR the e3 don't check the ps3 version or something else!
he erase the nor and flash your bkpps3.bin!
so forget the lock or unlock switch or something else! you only use the FUN Mode and for backup the nor the Backup switch!
it was test many times and it works 100%!
I have downgrade a fat and a slim with one e3 flasher!