M8 first of what FW you are currently on if below 3.55 then go to 3.55 if above 3.55 then do a downgrade.
1. OFW 3.55
2. CFW 3.55
3. Enable QA flag and check if it is enabled and delete enabler so you don't disable by mistake
4. Dump EID key with eid key dumper it will help decrypt ps3 HDD in case of ps3 death so data can be retrieved, and transfer it to external usb drive
5. Check if check sum is correct on downloaded update package and Install CFW of your choice rogero, rebug etc. 4.46
6. Install corresponding to FW file manager of your choice multiman, iris etc.
no.3 Is quite obvious use toggle_qa.pkg
no.4, Download eEID_RKDumper.pkg , install it , then run it console will dump eid key to hdd in dev_hdd0/tmp/ it will be file 48b in size named eid_root_key use file manager like multiman and copy it to external hdd/flashdrive. It's important to do it while on 3.55cfw as it only works on 3.55 and that's it.