How to upgrade the firmware(4.05 CSV )on RT82?

How to upgrade the firmware(4.05 CSV )on RT82? Now Retevis RT82 have the last firmware version is 4.05, and it have 4 editions: Retevis RT82(CSV)-V4.05 Retevis RT82(CSV-GPS)-P4.05 Retevis RT82(GPS-REC)-S4.05 Retevis RT82(REC)-D4.05 Today we will to talk about how to upgrade the firmware of 4.05 CSV Model. 1.Please download the firmware on:  https://www.retevis.com/resources-center 2.Please download the…

RT21 walkie talkies

RT21 walkie talkies:Troubleshooting

RT21:One walkie talkie can not talk with others When we buy walkie-talkies, there are always some problems which cause one of the walkie-talkie can not work together with others(such as RT21).But how to check the problems to fix it?you can find the reasons from the following aspects:   Troubleshooting: 1.Adjust volume to the Maximum,and make sure…