Hey could someone plz explain: I'm on DEX4.11 with 256MB NAND, everything is fine till now. I thought i can downgrade anytime via XMB to another DEX... So switching between DEX3.55 (peek&poke) and DEX4.xx OFW would be no problem. So why you need the downgrader PUP?
What about full-game-pkg or fake-updates or psn-discboot-games... I read a lot about that, but I first wanted a save way for switching between DEX 3.55 & 4.20 perhaps via debug-updates in hdd0/updater, because I have got no Linux anymore on 4.11 (at least not able to boot into petitboot)