Originally posted by Pianist
Install Rebug 4.80.1 REX/D-REX from XMB:
Download the latest Rebug REX/D-REX from the link above, verify the md5 hash with @DEFAULTDNB's PPC+, 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, NO game is mounted and that you DON'T Update via Internet or else you would risk installing OFW >3.55!
Enable QA and Activate the Spoofer:
Go to Package Manager > Install Package Files > PS3 Hard Disk and install Rebug Toolbox. Launch it under the Game column, go to Utilities and change Toggle QA Flag to Enabled. This is to ensure easier and safer downgrading. Now go to Selector and change System Mode to Rebug, this will activate the built-in spoofer to prevent accidental updates to OFW >3.55 and allow PSN access (not since OFW 4.70 was released). You can also change XMB Operation Mode to Retail and Debug Menu Type to CEX QA to ensure you have the Retail menus instead of the Debug menus which you probably won't need.
So is it possibly to go from 4.81 DEX directly to 4.80 DEX ?
I need to make sure that the System mode is changed to Rebug and the Toggle QA Flag is enabled, right?
I want to downgrade because of CCAPI.