August 3rd, firmware - master .bin file fails to upload, px4_fmu_v5 . I’m using pixhawk 4, I’m getting the following error However px4 file is uploading without any issue.
Have you found out why this happens? I’ve seen the PROTO_INVALID error a couple of times but not recently.
i did not went on investigating issue 
, i’m using the px4 file.