0x3800000 — SMC: silent sensor
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the sensor in the charging port assembly has stopped responding (decimal value 58720256). With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
On iPhone Air
Charging port flex (USB-C) / barometric pressure sensor
Low confidenceVerified sourceSMC: silent sensor
First check
Check the seating and condition of the charging port flex (tears, corrosion, FPC connector pins), then test with a known-good genuine flex; if the panic persists, measure the connector pins on the logic board in diode mode.