As you guys know, I was so desperate after 1.6.8 firmware upgrade and I was loosing RC signal within 40m-60m .. But After 1.5 months finally solved it permanently.. Here we go!!! In my method, Basically you need to put 1.6.80 firmware to your RC and also you need to put 1.5.70+ to aircraft. so How do we do that?>??? 1. You need upgrade your drone using LATEST DJI go app. ( if you are already in 1.6.8, then downgrade it in to 1.5.7 ) 2. After upgrading to 1.6.8 please close DJI go app, restart the drone and RC connect it, after that Switch off all the things. 3. Then download and put 1.5.7 firmware bin file to a SD card. 4. Put the SD card in to the aircraft WITHOUT turning it on. 5. Then turn on the aircraft WHILE PRESSING RC LINK BUTTON ON THE AIRCRAFT LEFT SIDE BODY. 6. Hold it on for like 20 seconds and release it. 7. Then complete firmware upgrading process will start and it will be over within 10-15min as usual.. 8.Then restart the drone. 9.After all these steps your RC will be stay in 1.6.8 and your aircraft will be 1.5.7+ and DO NOT UPGRADE AGAIN, unless you want the problem again.. LoL... Have a flight and PLEASE DON'T FORGET TO COMMENT THE RANGE YOU GOT!!!!! PS: And finally thanks you my friend "mpogrebnoy" ( from US ) for showing me that game changing screenshots ..