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One of my consoles was on 4.65.2 rebug but after installing PSN Patch (latest versions), everything stopped working even games wouldn't start. I know that it disabled some CFW features but I couldn't even get on rebug tool box to take off Cobra mode. I decided to take the hard drive out of the playstation and format it using my hard drive bay. I plugged the hard drive back into the console and using 'System Restore' in safe mode I attempted to install 4.65.2 rebug once again. However the firmware couldn't be found - tried several different links. I then decided to use a dex downgrader as I was on DEX at the time of all the errors. I am now on 3.55-DEX, however I am unable to update to 4.65.2 rebug as it's saying the file is 'corrupt' via system update. If you have any idea on how to go about this please let me know.

Thanks,
Kieran

Re-download 4.65.2 rebug and put iton USB (Fat32) and try it that way

I've done it thank you anyways, turns out I kept downloading REX and not D-REX.

Good deal, any questions you can PM me.