Back again with another blinking red light on my blackbox issue

I followerd the great tutorial video (http://www.youtube.com/watch?v=mDZbdVwttlg) from VKB to swap the stock ministick with a HAT. After completing this, plugged my SCG/MK III back in and got the dreaded blinking red light again.
Any idea what happened? I had a similar issue that was fixed by reflashing firmware (forum.vkb-sim.pro/viewtopic.php?f=25&t=4892). So, thinking this might help, I flashed to the correct firmware for my grip/base (_BlackBox_MK2_GF_SCG_v2_05_5.vkb) following this tutorial (https://www.youtube.com/watch?v=mCajFZ9e9gw&t=180s) just to see if that would help, but still got the blinking red light.
I'm stumped. Again.

For reference, my setup is:
Gunfighter Mk.III 'Space Combat Edition'
SCG Premium-R(ight)
T-Rudders Mk.IV