To quote: "We've just released v2.1 of the PS3Key firmware in two different flavors...
One is the easy-to-use .upd file which you can use with any genuine PS3Key using the PS3Key Updater Application for Windows.
The other is an 'open' HEX file which is designed for use on generic devices other than PS3Key dongles.
The v2.1 firmware update includes all of the features in v2 and also fixes a few other minor bugs."
New features in v2.1:
1. A series of minor bug fixes.
New features in v2:
1. Now supports peek/poke commands.
2. Backups on USB HDD can now run without an original game in the BluRay drive.
3. Works with Backup Manager 2.
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
So I'm unsure ... and am at work at the moment so unable to test either. Also, from what I've read, once you "Flip" flash a HEX onto the PS3KEY, you will no longer be able to use the official PS3KEY updates (.upd) files - which, at least right now, is not a problem as their releases lag psgroove/ hermes's.
Please keep us informed if you have luck with AT90USB162 or ATMEGAU32U4.