This came with Betaflight 4.2.4 installed, everything is fine. BUT engines don't spin with default bi-directional Dshot and RPM filtering. You must download and flash blheli_m or your protek 35 will never leave the earth. Given that blheli_m is open source and free and the drone this board is sold for can only fly; I found this poor choice on iflight and hence a star deduction. After going insane thinking I screwed up this board and wasting 30 minutes googling I got it and my drone back to flying condition.
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