I had the same problem. I was able to bring the V20 back to life.
1. Start the Updater.
2. Press and hold FX1 + FX3, turn on V20. In a few seconds the Updater will show V20 version 0.00.
3. Run the update to version 1.0.1. A light snake runs on the combo. Result Error, the snake is still running. Now for the interesting part.
4. Press Continue, Updater will show V20, version 2.00 (current). The light snake is still running on the combo.
5. Run the update to version 1.0.1. Now a red ProgressBar will appear, the update will end Succes. The combo restarts itself, it works.
6. Exit Updater. Turn off the combo.
7. Now we will perform a normal update to version 2.0.1.
8. Start the Updater, turn on the combo, do not hold down any buttons. You will see V20 1.0.1
9. Run the update to version 2.0.1 (I had the files offline, on the PC).
10. A light snake runs at the combo, end Succes, the snake runs out, the combo restarts itself. And it lives with version 2.0.1.
