APM arms, but motor aren't spining

After having replaced one esc that I burned because of a too hot soldering iron, APM arms but motor won't spin, except if I move the throttle stick up. When connected to MP, I have "system 1 is armed", but motors stay still. I can fly my copter, but

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APM seems to reduce drastically my RC range using openlrs

Hi everybody,

I figured out that i get a very poor range while using openlrs (hawkeye Tx/Rx) with APM (mini arduflyer from rctimer). Indeed, I get a very good range while testing in the city (maybe 700m with a lot of batiments), but when I try again w

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