iPhone panic 0x84, 0xd1: Vibration motor (Taptic Engine)
Panic codes: 0x84, 0xd1
How to fix it
The panic points to the vibration motor (Taptic Engine / haptic feedback).
1. Test with a known-good part.
2. Check its flex and connector.
By Hasan Patel, iPhone Fixer. Check your own panic