iPad 6 wifi not turning on after auto update took place to 15.6.1. now it is only detected in dfu mode by iTunes, but every time error 4042 comes while restoring. Same error when restoring to iPadOS 15.7. IT was running perfectly fine till iPadOS 15.4 (before update).

Logs for error 4042 on iPad 6 wifi. This is the second time an auto-update has gone wrong. (Earlier a similar update strangely disappeared all my iCloud files into thin air). Tried multiple times with different cables, Windows and MacBook(M2) computers, in different apps like iTunes, Apple configurator and Finder, still same error. [01:08:12.3612] <DFU Device 0x128eb6450>: DFU succeeded [01:08:12.3615] Finished DFU Restore Phase: Successful [01:08:12.3652] DFU mode device disconnected [01:08:12.3652] Device removed when in state Restoring, moving device to transition state [01:08:12.3653] Changing state from 'Restoring' to 'Transitioning' [01:08:12.3653] Creating timer to monitor transition [01:08:12.3653] Creating a timer for 10 minutes [01:18:12.3721] Timer fired to timeout transitioning device [01:18:12.3721] Changing state from 'Transitioning' to 'Disappeared' [01:18:12.3721] Device disappeared during transition [01:18:12.3721] Device isn't booted but USB is up. [01:18:12.3737] Restore completed, status:4042 [01:18:12.3737] Failure Description: [01:18:12.3737] Depth:0 Code:4042 Error:Gave up waiting for device to transition from DFU state to DFU state. PS - Tried with iPadOS 15.6.1 and 15.7 as they are the only signed versions available. Will try restoring with iPadOS 16 also when it comes out.

From many other posts, looks like the problem is with the touchID sensor. New update has a problem with it. Went to apple repair and they said to buy new ipad and they will recycle my ipad for free! Local repair shop repaired it. It disconnected the touchID sensor and ipad works fine now without TouchID fingerprint sensor. Costs around $60