X527AP

X527AP is the board identifier for an early Apple Watch model that was in development around the time of the Apple Watch Series 2. The identifier was discovered in Apple Watch firmware DaytonaSky 14S32871w.

Its board identifier is similar to that of X619AP, the first-generation iBridge processor, but the firmware it was discovered in contains LCM Patterns for 272x340 (38mm) and 312x390 (42mm) displays.

Additional diagnostic files suggest the presence of the following devices:
 * Battery.
 * MultiTouch display.
 * Speaker unit.
 * Microphone.
 * Wi-Fi module.
 * Bluetooth module.
 * GPS unit.
 * Vibration unit (or Taptic Engine).
 * Gyroscopic sensor.
 * Accelerometer.
 * Pressure sensor.
 * Stockholm (NFC) module.

All of the above devices are present on production Apple Watch models.