A 2010 ECM should have BUE-2D firmware.
99.999% your magic black box is NOT the problem. IMHO I suggest to FIX the bike using proper diagnostic procedures, then monkey with modifying the tune after it is running well.
Since you want to be a mechanic, here is a free copy of the 2009 service manual for you to read. There with be only tiny differences with your 2010 such as dual O2 sensors but it still contains ALL of the information you need to diagnose jerks.
https://www.buellmods.com/content/do...ice_manual.pdf
If you insist on guessing that the solid state extremely reliable magic in the black box is the culprit, I would suggest swapping it with a known good one (muffler won't matter) instead of changing your "tune". There are many other parameters that go with that .xpr file.
If you STILL insist that the magic black box is your problem, check out Rev-mo.com for instructions on how to open pandoras box for free.