I'm trying to solve an upgrade issue I'm having and can't seem to find anything about it on the internet. So I'm shooting in the dark here. Here's my setup: Mikrokopter (6-Rotter) - FlightCtrl 2.1 Graupner MX-20 with HOTT GR-16 I recently decided to do the firmware upgrade on the MX-20 as described on http://wiki.mikrokopter.de/en/MX-20#Sprung1 Everything went fine with the firmware upgrade. Copied all files to the mind-SD card. But when I went to select the new Voice files, I get an error message "Wrong Data Format". I've re-downloaded, tried changing the names of the file to match the previous file names, and ultimately, tried to re-install the previous Voice Files, all with no success. So now I'm stuck with no voice feedback. Was wondering if anyone had experienced this before, and if so, how did you fix it. The MX-20 firmware is now at version 2.