I am currently downloading a possible 4.21 CFW (or MFW) Do you know anyone who can test it out? to be on the safe side use a Flashed PS3.
Or someone who can dissect a PUP file and just see if it's legit? It's 192mb in size. I hope this isn't a DRM CFW 4.21.
I am uploading it right now, should be up soon...
that would be helpful