The classic method
(manually copy the firmware file onto the SD card).
(Note: Do not power off or remove the SD card during
the firmware upgrade process.)
1. After downloading the firmware, unzip the downloaded file, find the Split4g.BRN file
and copy it to the root directory of the microSD card. The firmware name should be
confirmed as Split4g.BRN.
2. Turn on the RunCam Split 4 V2 with the micro SD card inserted. The camera will
automatically update the firmware.
3. Orange light blinks slowly while firmware is upgrading.
4. After 1 minute, the camera will automatically shut down,upgrade has completed.
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I notice you've shared a partial or potentially mangled title: