If you are experiencing the below problems flashing firmware with OpenTX companion or EdgeTX Flasher please follow the guide below.
If you see the following error in OpenTX Companion
"Error: Command not correctly executed"
Similarly, when using the EdgeTX-Flasher to write firmware, if it stops at this line of text:
"Download[] 0% 0 bytes"
If either of the above situations occurs, it means that Read Protection is enabled on your MCU. Please follow these steps to reset it.
 | DFU Reset tool download |
1. Download Reset_DFU.zip, then unzip
2. Unzip the contents to a folder on your PC
3. Run the Reset_DFU.CMD file
Once you see the line in the red box below, the MCU has been reset.
Now use OpenTX Companion or ExgeTX flasher to write the firmware again, everything should work normally.
OpenTX Companion
EdgeTX Flasher