Obtaining H-Boot S-Off makes up some of the most important and empowering development work on the forums. Back in the day, thanks to awesome developments teams such as Revolutionary, S-Off was nothing more than a minor annoyance. However, since the launch of the HTCDev website and the inclusion of newer, better security measures that prevent downgrading, achieving S-Off is now a bigger challenge than ever.
Not long ago, we reported that this problem had finally been solved on the HTC EVO 3D. Now the HTC EVO Shift 4G has joined the ranks. XDA Senior Member Indirect has posted a method that will get users down from the newer H-Boot and onto a version that can be made S-Off with relative ease and is available for Shift owners right now.
The method, while not as dangerous as the phone-bricking method used by its 3D cousin, should still be done with the utmost care. It isn’t particularly difficult and doesn’t require a lot of time, but it does employ ADB flashing files that Indirect has so kindly included. If you’re a little iffy on using ADB, be sure to read the instructions extra carefully before proceeding. Basically, it involves ADB flashing the popular tacoroot and then flashing an .img file over the bootloader partition, effectively downgrading it. Using this method, users can downgrade their H-Boots, obtain S-Off, and avoid all the S-On flashing woes.
For the full tutorial, download links, and discussion, check out the development thread. As stated, be sure to use the utmost care when performing the process._________