You can enable QA first but you don't have to because you can enable it after you upgrade. So just install Rebug 3.55.4 from XMB and then install Rebug 4.41.2 by following the guide below:
Originally Posted by fb280
1- Make NOR/NAND dump (optional):
Install latest version of multiMAN (4.40.00), plug in a FAT32 formatted USB flash drive into the right USB port, launch multiMAN under Games and go to mmOS > Press [O] on any file > Open in HEX viewer > Press [SELECT] > Press [START] > Export GameOS LV2: Select No > Export HV LV1: Select No > Export FLASH: Select Yes
2- Install Rebug 4.41.2 from XMB:
Download Rebug 4.41.2 from Rebug's website, verify the md5 hash, rename the PUP to PS3UPDAT.PUP, put it on your FAT32 formatted flash drive in PS3\UPDATE, go to System Update and Update via Storage Media. Make sure there's NO original game disk in the drive and that you DON'T Update via Internet or else you would risk installing OFW higher than 3.55!
3- Enable QA:
Install Rebug Toolbox from Package Manager, launch it under Games, go to Utilities and enable QA. This is to ensure easier and safer downgrading.
Regarding backing up your disk and mounting it from the HDD, that's not a feature withing Rebug CFW, you have to use a Backup Manager for that. The only Backup Manager compatible with 4.41 CFW is mM 4.40.00. It has a File Manager (mmOS) and an FTP Server as well.
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!