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How to downgrade a MODIFIED 3.41 fw

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Hi guys, I've been really confused lately. I recently bought a used jailbroken PS3 slim from my friend, which come with a PSJailbreak dongle to play games (which seemed a clone dongle since my PC cannot recognize it, hence it cannot be updated for downgrade). I decided to upgrade it to the 3.55 kmeaw or 3.55.2 rebug cfw.

However, the 3.41 installed firmware is seemed a modified one, since EVERY firmware I tried ( 3.55.2 rebug & OFW ) are corrupted when installed from XMB, and cannot be detected when installed via recovery mode, though there is no mention of a 3.56 fw or something like that.

Quite similar like this thread (http://www.ps3hax.net/showthread.php?t=17975). From what I read, It seemed that I have to downgrade my FW, then upgrade it to 3.55.

The problem is I can't enter the PS3 FSM. I have tried using:
  • PS3JIG with both of PSP 3000 6.20 and PSP 2000 5.50 - It boots normally, just show that an unknown device is detected.
  • CrashSerious's FactoryServiceMode Tool v0.2 - Cannot install the CEX/retail version, said it was corrupted (I'm sure it's not), while the Debug/DEX version install just fine, but beeped thrice and failed, outputting "ERROR: failed to read EPROM" in the factory.txt error log no matter how many times I run it.
  • Want to try to install the QA Flag, but I doubt I can install the Gitbrew's OtherOS++ 3.55 Special CFW

My question is: is my FW is the infamous 3.41(3.56) spoof fw? Anyone have similar problem? How can I downgrade it? I prefer the dongle-less method to save money, but if I have to buy, which one is the cheapest WORKING downgrade dongle, and where can I get the ORIGINAL one?

Note: My PS3 minimum FW is 3.40, and I have the fw grabbed from this thread (http://www.ps3hax.net/showthread.php?t=17845. PS: thanks for STRATEGIZER for the reupload ;))

Thank you for your time. I have been searching the solution for days, and my effort seems futile. Any help will be greatly appreciated.

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