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It's been a long time (successful downgrade to firmware 2.00) : r/PS3
I purchased a PS3 backward compatible from ebay for a good price and I'm impressed how clean it is. However... It's still on firmware 2.50. Should I update the firmware? : r/PS3
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How To] Downgrade Fat PS3 From 4.66 to 3.55 Firmware Using E3 Flasher Tutorial (Part 1 of 3) - YouTube
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PS3 3.66 Downgrade Tutorial by The Jailbreak Master 1 | PDF | Play Station 3 | Usb Flash Drive