И что там такого уникально интересного в GSX? Описание стандартной сервисной процедуры: "если клиент обратился с проблемой, касающейся Touch ID, не спешите менять девайс, а проверьте, далее по списку. Описание разных возможных ситуаций и способы проверки.  Весьма стандартное и не говорящее ничего про массовый отказ или проблемы. Обычный информационный бюллетень для сервисмена. Ну умеющего понимать английский текст по профессии. И чтобы ни у кого не осталось сомнений в том, что именно знает "Мастер" про Apple GSX, вот оригинал текста бюллетеня от 8 января (многа букоф):TS5363 Learn how to troubleshoot Touch ID issues "Customers may report that they can't enroll their finger on their iPhone 5s or they can't reliably unlock the device with Touch ID.Don't service or replace the device for issues with a specific finger or fingers. If the user has an issue with certain fingers, explain that Touch ID may be unable to match those fingers consistently. This is usually caused by the readability of that fingerprint, and the user can either try to re-enroll the finger or use a different finger for Touch ID.Before you troubleshoot any Touch ID issuesCheck for any obstructions from cases or protective films.Make sure that the Touch ID sensor, the ring surrounding the sensor, and the finger being tested are all clean and free from any debris or obstructions.Make sure that the customer has enrolled a finger on the device and is using Touch ID properly. Learn more about using Touch ID.Update the software on the device by going to Settings > General > Software Update.The customer can't enroll their finger on their deviceTo test the device, follow these steps:Ask the customer to enroll different fingers.During the enrollment process, remind the customer to slightly move their finger and wait for the phone to vibrate before lifting their finger.Restart the device and try again.If the issue persists, enroll another person's finger. Service the device if it won't enroll the finger successfully.The customer is having intermittent issues where the device won't unlock using Touch IDSkin conditions change over time and certain activities, including exercising, showering, swimming, and cooking, can affect fingerprint recognition. Environmental changes, including moisture, lotion, sweat, oil, cuts, dry skin, or temperature change, can also affect fingerprint recognition.For best results, cover the ring around the sensor when you unlock the device. If the issue persists, follow these steps to test the device:To re-enroll the finger, go to Settings > General > Touch ID & Passcode > Touch ID > Add a Fingerprint, and re-enroll the original finger. If necessary, delete a fingerprint from the device.During the enrollment process, remind the customer to slightly move their finger and wait for the phone to vibrate before lifting their finger.After enrollment, ask the customer to unlock the device using Touch ID. There are two ways to unlock the device with Touch ID:Press the Home button once to wake the device, and then lightly touch the Home button until the device successfully unlocks or "Try Again" appears.Press the Sleep/Wake button once to wake the device, and then lightly touch the Home button until the device successfully unlocks or "Try Again" appears.If the customer can't unlock the device successfully after several attempts, service the device.The customer can't unlock the device on the first try after using the Home button to wake the deviceAfter the device wakes up, follow these steps:Make sure the customer is waiting for the Touch ID sensor to read the fingerprint before lifting their finger.If the customer allowed enough time for the Touch ID sensor to read the fingerprint but is still having the issue on the first try (and following attempts are successful), don't service the device as it won't resolve the customer’s issue.Please remind the customer that they can also use the Sleep/Wake button to wake the device before using Touch ID and that they should keep the software on the device updated.After replacing the deviceAsk the customer if they want to check the replacement device and help the customer enroll their finger during the setup process."