Update: http://ps3break.com/news/51.html has also updated their hex codes to support PS3 Firmware 3.55 Spoofing.
To quote: It is the same as the 3.50 spoof payload, tricking your console into thinking its on the latest firmware. This does not allow you to go online, or play newer games. The purpose of the spoof is to prevent your console from telling you to update, that's all.
This update only stops you from updating to v3.55. Unfortunately PSN and v3.50 firmware based games are still unavailable.
Which means and I must stated in BOLD:
NO ONLINE PSN GAME PLAYING
NO GT5 (original or backup)
NO N4S:HP (same as above)
NO UNLOCKing YOUR PSN CONTENT
It appears the PS3Yes Team have worked out a way to properly spoof the PS3's 3.55 Firmware requirement and have released some hex codes for their PS JailBreak clone USB devices below.