If your TX800 is flashed with 4.3 firmware, unlocked but can't stay at a certain power, for example, it can't stay at 400mW following a power cycle. You may try the following steps:
1. Set the number of power groups to the value in the figure below, and set the fifth group to an invalid value (888): The following 1-5 groups correspond to 25 milliwatts, 200 milliwatts, 400 milliwatts, 800 milliwatts, and invalid milliwatts. Click Save.
2. Set the power value to 400, and click save, if you find that the orange light of the VTX is flashing quickly, it means that the VTX has turned on 400 milliwatts.
3. Then set the power to invalid 888, and click save, if you find that the orange light of VTX is still flashing quickly, it means that the power of VTX is still 400 milliwatts. (This is set to prevent the FC from setting the power of VTX back to 25 milliwatts when the FC is restarted).
At this time, the power of VTX will stay at 400 milliwatts.
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