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…

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