We are all familiar with the work of XDA developer Cotulla, who is part of the DFT (Dark Forces Team) and responsible for allowing us to flash custom roms on many of the newer devices thanks to the HSPL unlocker. Due to a recent original firmware update for the HD2, the HSPL was overwritten to 2.10, which was no longer recognized by the unlocker. There were ways to go around this though, like flashing back to an older official rom that contained the 2.08 HSPL required by the unlocker, but even that was a bit cumbersome.
Cotulla released HSPL3 to solve this issue. This unlocker should replace the 2.10 version found in the rom release 2.13 and enable flashing of custom roms. Of course, this unlocker works with all versions of the HD2 (European, US, and others)
You can find the unlocker and more information in the original thread._________