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15.2 V21 Receiver Firmware Upgrade
1. Click on the official website to download the firmware, select the appropriate
version and save the firmware to your local area.
2. With the receiver disconnected, connect the receiver's TTL interface to the PC
via the receiver's frequency pairing cable.
3. Press and hold the SET button on the receiver while powering up the receiver.
4. The indicators RX and TX indicator light ON long enough to release the button.
5. Open the upgrade software tool within 1 minute.
6. After a successful connection, it can be seen that the firmware upgrade tool
serial port is connected and shows the current version of the receiver,
firmware and other information.
7. Open the path to the firmware file you have just saved, confirm that it is correct
and click the Start button.
8. Wait for the firmware upgrade until the firmware upgrade completion dialog
box pops up, close the firmware upgrade tool, firmware has been upgraded
successfully
