*NOTE: If the 6.20 updater says 'Firmware is already 9.90. That's fine because when you go back to CFW it'll appear again. Note that some the games in your XMB would disappear. After it installs, you should now be in the 6.20 original firmware. It will get rid of the 5.50 Prometheus-4 for you. Go to the games section, there you would find the 6.20 Sony OFW update. You should receive a file called 620.PBP Ģ. You can download copies of it off the internet. Grab a copy of the 6.20 Sony OFW (Official Firmware), not 6.21, not 6.30. How to Upgrade 5.50 Prometheus-4 to 6.20 PRO-B4 Permanent for Dummiesġ. It's likely to work too with 5.00 m33-6 and 5.50 GEN-D3. Again, this is what I did with my 5.50 Prometheus-4. One good source of CFWs and homebrews is. Now, I won't be putting on any links since you can already find them in the internet. Just make that Hellcat's Recovery Flasher 1.65 handy. Don't worry, there's a high chance you'll succeed too. Now, if your PSP gets bricked, it's not my fault because it worked for me. I found it out the hard way so you won't have to.ĭisclaimer: This is what I exactly did. Seeing that there are people out there like me who have no idea what to do to upgrade to 6.20 PRO-B4, I'll make a simple guide here. It took too long and irritated the hell out of me. I just updated my custom firmware a few hours ago from Liquidzigong's 5.50 Prometheus-4 to Coldbird's 6.20 PRO-B4 Permanent.

So don't mind it, just disregard it and leave it alone. So again, just follow what I mentioned below and you should be safe and guaranteed to be virtually brick-free.īTW, the SDK Folder in 6.35 PRO-B5 and 6.20 PRO-B5 I heard is for the developers.

Popsloader psp 6.61