Update: Davee commented on that and cleared most of the questions everybody had:
coldbird is right, a downgrader “isn’t” possible. He is talking natively, mine hooks into the decryption routines to allow it
That makes sense. Thanks to Matt for the tip.
Original article 01/09: According to Coldbird, one of the developers of Hen PRO 6.35, Sony removed the possibility to run old updaters in firmware 6.35. He stated that it is not possible to downgrade from 6.35.
No you can’t downgrade. In fact this isn’t even a problem with 6.35 PRO, but with Sony.
Sony removed Updater Kernel Module Support for old Kernel Updaters in 6.35, so… once you go 6.35 – you don’t go back.
That’s it basically.
That being said, downgrading is IMO a thing of the past. We used downgraders back in 2006 when Custom firmwares where just a concept. Today tools such as the TN Hen or Hen Pro are closer to a Custom Firmware (I like to call them “Light Custom Firmware”) than actual Homebrew Enablers, as they ship with lots of features that used to be exclusive to Custom Firmwares (recovery menu, plugins support, etc…). So nowadays there’s no real need for people to downgrade unhackable motherboards…
Source Coldbird’s blog (thanks to TerryCee for the tip)