I did multiple test , drone is immediately crashing as soon as i increase thrust, i thought it is a pid related issue and started changing these values and but drone is immediately flipping after taking off.
i am using speedybee f405 mini , there#s only 8 mb flashmemory available.
i already checked these things.
drone is physicallly mounting in normal way, facing forward,
all motors are rotating correctly .
i did a bench test iwth props removed and every motor is running around 1950 rpm at maximum.
Looking at the log, I would first check the propulsion system around Motor 1.
At approximately 51.94 seconds, the log records ERR Subsys 25, ECode 1, immediately followed by Potential Thrust Loss (1). These appear to be the same thrust-loss detection event rather than two separate failures.
The throttle output also continues increasing and eventually reaches its maximum, while the vehicle is still unable to generate the expected thrust. This suggests that the FC is asking for more thrust but the propulsion system is not producing the expected result.
My first suspicion would therefore be a mechanical issue with the Motor 1 propeller. I would check whether the propeller is properly tightened, installed in the correct direction, and whether the hub or mounting surface is slipping under load.
The second possibility would be the ESC/motor side. A poor connection on one of the three motor phase wires, a connector/solder joint problem, or an ESC/motor issue that only appears under higher load could produce a similar result.
There is also an ESC telemetry error-rate value recorded for ESC instance 0 before the thrust-loss warning. However, I would not consider this alone as proof of an ESC desync or phase-wire problem, since this field represents the telemetry error rate.
I would check Motor 1 in this order: propeller mounting and direction → motor mechanical condition → the three ESC-to-motor phase connections and solder joints → ESC operation under load.
Based on the log, I would focus on a Motor 1 propulsion hardware issue before looking at the flight controller or EKF.