I 'm having trouble updating the firmware on my detrum blitz-dt9 transmitter. I downloaded the DT9 firmware upgrade (V1.08.zip) and unzipped it onto a micro SD card. However, after following the steps to make the upgrade, all I got was a grayed out screen and a thumping sound that wouldn't stop until I pulled out the card. I tried again with a new SD card and it keeps doing the same thing. Is it possible for me to reset the transmitter to factory settings? This is a new system. I haven't even done all the steps to set up the transmitter for use - except for a mild calibration. I thought it would be better to do the upgrade first. would that be the problem?
.png)