So I've been following this tutorial:
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I have gotten to the part where you install the 4.25 to 3.55 FW and then run QA Flag and now I'm stuck. Everytime I try to install the second FW, Rogero 3.55 v3.7, it just sits there and says checking when I try to update from the recovery menu and then it says data corrupted from the XMB. I'm in need of help now guys. Let me know what ya got.

So I've been following this tutorial:
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I have gotten to the part where you install the 4.25 to 3.55 FW and then run QA Flag and now I'm stuck. Everytime I try to install the second FW, Rogero 3.55 v3.7, it just sits there and says checking when I try to update from the recovery menu and then it says data corrupted from the XMB. I'm in need of help now guys. Let me know what ya got.

- Updating from CFW3.55/4.21/4.30 to the CFW4.21/4.30 v2.00 should be done using the following steps :

1- If you are on any CFW newer then 3.55 you can try updating from Recovery Mode to CFW4.21/4.30 v2.00.
---- If it didn't work (Data corrupted Error), then you'll have to Downgrade back to Rogero CEX3.55 v3.7 using the guide below.

2- Once on Rogero CEX3.55 v3.7 or any 3.55OFW/CFW, Update using the XMB update option to CFW4.21/4.30 v2.00
---- If it didn't work (Data corrupted Error), Start the PS3 into Recovery Menu and update to CFW4.21/4.30 v2.00.

Hmm data corrupted pup installion has never personally, except for a back up save i recall once i think... Anyway i remember reading about corrupted data with involving with some Rogero CFWs..... *5 - 10 googling minutes later*
Try this

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If that doesn't work, try this & bookmark it too for future, (it once helped me out +easy step-by-step clear tutorial unlike some others out there)
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Edit: And or this You must login or register to view this content. Rogero 4.30 v1.04 may work too

That's what I have been doing, and I'm stuck on the hybrid FW.

There's a hybrid CFW?? huh i did not know that....... Hmm erm.. ↴
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recommend tho you backup your PS3's HDD content, data, saves, music before format tho ye

I've already found this so I'm probably gonna try it:
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Or this:
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