Since we didn't have S-OFF on Runnymede, I decided to work on it, and here is the result:
It's basically a patched bootloader that pretends S-OFF (not to be confused with Radio S-OFF.)
The following commands have been tested and working correctly:
erase (system, recovery, boot)
flash (zip, system, recovery, boot, hboot, radio)
and here is the flash "zip", "hboot", and "recovery" demo:
It's still under development; since many people asked me to release it, I decided to release a public beta:
Open the attached file and follow the instructions.
You'll need to install a stock RUU (or if not available, you can flash this stock recovery posted by fshami on an unlocked device) and install HTC Sync Drivers.
Note that this is not guaranteed to work and I won't take any responsibilities if something bad happened to your device.
I had lots of fun modifying Runnymede HBOOT and it was a great experience. I want to say thanks to all of the testers for their feedback and also for being nice and patient (maybe I should have released this after my exams, so I'd have enough time to work on it), and I'm sorry for the problems you may have faced because of the incompleteness of my work.
Recently unlimited.io guys (known for Juopunutbear S-OFF) provided their patched HBOOTs. Apparently these are available for GB and ICS, by-pass CID check and have optional update protection:
It was identified by XDA memeber fardjad that the hboot partition on the runnymede is not protected and can be written to with a rooted phone. One of the members of unlimited had for a short period of time the occasion to use a Sensation XL. Having seen the discovery made by fardjad and due to some limitations in the procedure, this memeber created hboots which provide more complete S-OFF functionality as well as providing overwrite protection. Almost immediately afterwards the European Sensation XL obtained an ICS update. Unfortunately for may users this meant that a new and backward incompatible hboot was introduced. The unlimited member again created modified hboots for his own use. It was not originally intended that these hboots would be released for general use, however we are aware that many users are unhappy with the limitations of unlock but have had to do this in order to make full use of ICS. We have therefore decided to release the GB and ICS versions of these hboots.