How to Install OpenGD77 on an HT for Satellite Ops! 

Here's my best attempt at explaining how to install OpenGD77 Firmware on the Retevis RT3S, TYT UV390 and Baofeng DM1701. All 3 use the same process just different versions of the firm found on OPENGD77's Website
Links:
www.opengd77.com
Retevis Software:
www.retevis.co...
TYT UV390 Software:
www.buytwowayr...
Baofeng DM1701 Software: www.baofengrad...