Well I semi-bricked by trying to install an RCO theme and didn't realize until later that my back up was still 3.52 M33 (stupid me).
Anyways, I can't recover/downgrade now. I can get to recovery mode fine, but I can't get back to 1.5.
I've tried this thing but apparently it only works when launched from the XMB, and the regular recovery folder does not work.
Unfortunately I don't have a Pandoras battery either b/c of lack of an extra one.