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[Solved] Apple Pencil Pro Squeeze & Hover Gesture Failure on iPad Pro 13″ M4: How to resolve Digitizer sensor BLE calibration handshake desynchronization

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Home › Forums › iPad & iPadOS Support › [Solved] Apple Pencil Pro Squeeze & Hover Gesture Failure on iPad Pro 13″ M4: How to resolve Digitizer sensor BLE calibration handshake desynchronization

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  • November 14, 2026 at 10:20 pm #13355
    Amanda Patel
    Community Contributor
    Diagnostic Hardware Specs: iPad Pro 13″ M4 | OS Version: iPadOS 18.1 | Archive Source: Apple Support Community #256858662

    I am running into a persistent issue on my iPad Pro 13″ M4 running iPadOS 18.1.
    Whenever the machine encounters Digitizer sensor BLE calibration handshake desynchronization, the following diagnostic log appears in Console:

    PencilService: [Bluetooth] Haptic squeeze sensor payload CRC mismatch on peripheral 0xef88

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    Apple TV 4K 3rd Gen | Dual HomePod mini | iPhone 15 Pro Max | London, UK
    Smart Home & Matter/Thread Integrator | "Verified Apple Discussions Archive"
    November 14, 2026 at 10:20 pm #13356
    Joan Chen
    Community Contributor
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Forgetting Bluetooth device, cleaning magnetic inductive strip, and recalibrating Squeeze threshold.

    Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

    1. In Settings > Bluetooth, tap (i) next to Apple Pencil and select Forget This Device.
    2. Wipe magnetic charging edge of iPad and flat edge of Apple Pencil with microfiber cloth.
    3. Force restart iPad (Vol Up, Vol Down, hold Top button). Re-attach Pencil to recalibrate.

    Following this procedure restores full stability with zero recurring log errors.

    MacBook Pro 14″ M4 (32GB) | Studio Display | YubiKey 5C NFC | Lyon, FR
    Apple Certified Support Professional (ACSP) | Enterprise Mac Sysadmin & Jamf Pro Architect
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