iPhone panic 0x71, 0x74, 0xb00000: Speaker / audio output

Panic codes: 0x71, 0x74, 0xb00000

How to fix it

The panic is audio related: speakers, microphones or audio output.

1. Test with a known-good loudspeaker and earpiece.

2. Check the audio flex and the audio ICs.

By Hasan Patel, iPhone Fixer. Check your own panic