Here's what you need to do:
Originally Posted by bennie8888
1- Make NOR/NAND dump (optional):
Install latest version of multiMAN, plug in a FAT32 formatted USB flash drive into the right USB port, go to mmOS->Select any file->Open in HEX viewer->[SELECT]->[START]->DUMP LV2(NO)->DUMP LV1(NO)->DUMP FLASH(YES)
2- Install Rebug 4.30.2 from XMB:
Download Rebug 4.30.2 from Rebug's website, rename the PUP to PS3UPDAT.PUP and put it on your FAT32 formatted flash drive in PS3\UPDATE and go to System Update and update from storage device (or something like that). Make sure there's no original game disk in the drive and that you don't update from the Internet or else you would install OFW!
3- Install Rebug Toolbox:
Install Rebug Toolbox from Package Manager, launch it and enable QA under Utilities. This is to ensure easier and safer downgrading. You can also change System Mode to Rebug to spoof to 4.31, XMB Operation Mode to Retail and Debug Menu Type to CEX QA. This is to ensure you have the Retail menus instead of the Debug menus which you probably don't need.
No need to enable QA while on 3.55 anymore because the latest Rebug Toolbox can enable QA on any 4.xx CFW.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!