Snippet from XDA official HSP2 thread. Definitely not for the Tmobile HD2 as stated in the bottom of this post. Cut&paste from that thread:
http://forum.xda-developers.com/showthread.php?t=611433
22/03/2010
well,
HSPL2 comes
To install/uninstall this HSPL there must be any SPL version from this list on your device:
SPL 1.42.0000 SPL 1.42.HSPL
SPL 1.62.0000
SPL 1.66.0000 SPL 1.66.HSPL
SPL 2.07.0000
SPL 2.08.0000 SPL 2.08.HSPL
Other versions are not supported. (They are rare however...)
Now you can uninstall HSPL via same program, you no longer need to flash rom from SD card!
In HSPL2 you can select which version of SPL you want to install in the device.
There included 6 SPLs:
OSPL 1.42, OSPL 1.66, OSPL 2.08 (Original SPL)
HSPL 1.42, HSPL 1.66, HSPL 2.08 (Hard SPL)
Remember that some ROMs have old SPLs, for example 2.10 ROM have 2.08 SPL, 1.72 ROM have 1.66 SPL and etc!
You can install any of them using HSPL2.
Disclaimer
This product is free to use, but at your own risk. We take no
responsibility for any conflict, fault, or damage caused by
this unlocking procedure. No warranties of any kind are given.
We have tested our product on several devices and have not
found any problems with it.
1024LEOs (from T-Mobile with 1024ROM) ARE NOT SUPPORTED