That was faster than expected! pspgen.com released the new version of Total_Noob’s Hen for OFW 6.20. The main new feature is a bug fix for PSP3000 owners, this version should now work on all PSPs with a firmware 6.20 (no, this doesn’t work on 6.35 yet).
Another new feature is the possibility to downgrade your PSP. I want to insist on the fact that downgrading is a dangerous procedure. There is a huge risk of brick on newer PSP models, and I personally don’t see the point in downgrading a 6.20 PSP. You have been warned.
Total_Noob also added some major bug fixes, which should greatly improve homebrews and plugin compatibility. One of the fixes is courtesy of Hackman.