It's been a long time (successful downgrade to firmware 2.00) : r/PS3
JOGi MODS :: PS3 Downgrade Service - Back To 3.55 OFW
PDF) Tutorial PS3 MinVerChk - Minimum Downgrade · Tutorial PS3 MinVerChk - Minimum Downgrade Firmware Check Tool By OzchipDev This tutorial will show you how to see the base firmware - DOKUMEN.TIPS
Downgradable PS3 Models - Wololo.net
1 Set Board Hard Drive Tray Downgrade Tool For Ps3 E3 Nor Flasher Console Parts Firmware Backup Downgrade Tool - Accessories - AliExpress
Downgrade PS3 w jedeń dzień | Game-Box Serwis Konsol
PS3 - Chapter I - PS3 Downgrade General Information | PSX-Place
PS3 3.66 Downgrade Tutorial by The Jailbreak Master 1 | PDF | Play Station 3 | Usb Flash Drive
How To] Downgrade Fat PS3 From 4.66 to 3.55 Firmware Using E3 Flasher Tutorial (Part 1 of 3) - YouTube
PS3: Firmware-Downgrade - so geht's - CHIP
How to Go Back to OFW 3.55 in the PS3 Recovery Mode - Our Pastimes