1. Download PS3 Firmware 3.55 (PS3UPDAT.PUP file).
2. Patch PS3UPDAT.PUP file with the patch included in this package using the "bsdiff" tool (http://www.daemonology.net/bsdiff).
3. Install the patched PUP file like a normal firmware update.
(in case you're already in 3.55 you need to install it in recovery mode).