Last week S-OFF was achieved on the HTC EVO 4G LTE using a tool named Lazy Panda. For those that it worked for, they were left with a completely unlocked S-OFF EVO that would display a red warning message when booted into the bootloader that this was a development device and not for use. RegawMOD Bootloader Customizer 3.1 is a tool that allows you to change this dire warning to say whatever you want it to say.
The program runs on your computer and allows you to choose what you want displayed, instead of the dire warning message. Additionally, it will allow you to set the text in the pink bar above the S-ON/OFF status line.
RBC creates a flashable PJ75IMG.ZIP containing a modified hboot that you flash through the bootloader. As such, should you have a particularly awesome thing to say, or if you only have access to a PC at work, you can post your modified hboot for later/mass use.
The new tool is currently Windows-only at the moment and will require .NET 3.5 or above installed.
While any flashing comes with risk, flashing a modified hboot carries a lot more risk than any other form of flashing: if it doesn’t flash correctly, you can’t even get to recovery. So make sure you read up carefully, as changing a developer warning message into “HTC is a butt!” is not worth bricking your phone over.[xda-developers]