The official firmware 6.60 has been released and Sony claims they has been improved stability during use of some features.
Remember this is an official upgrade, meaning that this procedure will revert anything you’ve done to your console, for instance, it will revert any hacking. In other words, You will NOT be able to play backup games from the memory stick, you will NOT be able to run homebrew, and you will NOT be able to downgrade your PSP to a lower version unless your PSP is 100% hackable.Also remember that any exploit may have been patched.
Do the following steps at your own risk. Remember that only you are responsible of what you do to your console. Although I followed this method successfully, I won’t take responsibility if you brick your console.
Upgrading to 6.60
- Download and extract the official firmware 6.60. (PSP GO user use this firmware).
- Rename the 660.PBP file to EBOOT.PBP
- Copy the EBOOT.PBP file into PSP/GAME/UPDATE on your MS. Create any folder if necessary.
- Remove your PSP safely.
- Now go to the XMB, go to game menu and run the update as is shown on the video.
Installing Custom Firmware 6.60 PRO
Once you had installed the official firmware 6.6, you can proceed to install the Custom Firmware 6.60 PRO.