If nobody tried doing something fancy with this un-named illegal software, then perhaps there is a chance. If somebody DID use it then you're wasting your time.
Try downloading JL_Commander to wipe your 9700. How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
Use your pc to download the latest OS version for the 9700 (doesn't matter if it's not a T-Mobile version) from the sticky HERE
. Follow the FAQ instructions for upgrading your OS: How do I upgrade the OS on my BlackBerry? - BlackBerryFAQ
Be sure to delete the vendor.xml file once you download and install the OS onto your pc. I forgot this step once and almost ripped out all my hair trying to figure out why the install process ground to a halt. Just look at my profile picture to see the result! Before the attempt to upgrade my OS I looked like freakin' Fabio!