How to update firmware for DIY series receivers

I. Connecting the Receiver

Note that the RX pin on the receiver should be soldered to the TX pad on the flight controller board, and the TX pin on the receiver should be soldered to the RX pad on the flight controller board.

II. Configuring the Flight Controller

Correctly configure your flight controller. The following settings apply to INAV, Betaflight, and other flight controller software.
If any of these settings are incorrect, the following steps will not proceed smoothly, and you may encounter issues later.

1. After completing the flight controller software configuration, close its configurator and unplug then reconnect the flight controller board's USB cable, or disconnect and reconnect it from the computer to refresh the connection and ensure the port is not occupied.
2. If these settings are incorrect, subsequent operations, especially updating via the Passthrough method or the receiver not working properly, will be affected.