126.96.36.199 is a great way to get back to ICS from JB Port via TWRP (I'd flash twice and factory reset). I'm going to provide a download link here, but will not be held responsible for anything you do with it. For example although the firmware worked for me and others it may brick your device, there may be some reason to ASUS' madness.
Here's what we know about 188.8.131.52:
- update increases I/O slightly.
- .26 Root Method Still Valid
- New Boot and recovery partition written
- apparently more compatible with JB