You can't downgrade from 3.56+ to a lower firmware unless it has the E3 flasher attached to it, or it has already been on 3.55 and it was upgraded using the cfw versions of the firmwares.
You can only downgrade with a Flasher and ONLY! if your PS3 is compaitable to go down to 3.55 you can check your model here; You must login or register to view this content.
You can only downgrade with a Flasher and ONLY! if your PS3 is compaitable to go down to 3.55 you can check your model here; You must login or register to view this content.
Actually, this is more accurate: You must login or register to view this content.