Error code
iOS 53
IOS53
System Error Code· A POSIX/system errno returned when a system call fails.
What it means
iPhone hardware security check failed — Touch ID sensor or its secure connection to the Taptic Engine processor could not be verified after a repair..
How to fix it
- This error requires service — contact Apple Support or visit an Apple Authorised Service Provider.
- A genuine Apple repair that replaces the Touch ID sensor with a matched component will resolve the error.
- Do not attempt further restores.
- the device will not activate until serviced.
Not affiliated with iOS. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More iOS codes
- 1015Cannot restore to a downgraded firmware version — iTunes detected an attempt to install an older iOS than what Apple currently signs.
- 1110USB configuration or device state error during restore.
- 1394Component or IPSW validation error — iTunes encountered an error validating part of the firmware bundle.
- 14Communication error during restore — the device connection was lost and the IPSW could not be fully written.
- 1600Device not in correct recovery or DFU mode for a custom restore.
- 1601USB driver or host-side communication failure during a recovery-mode restore.
- 1602Connection interrupted at the start of a recovery-mode restore — iTunes could not complete the initial handshake.
- 1604Unknown error during recovery-mode restore — device communication failed partway through.
- 1671Software update is downloading — this code is shown while the device is in the middle of downloading its update.
- 17Device could not be restored to the selected iOS version — the firmware is no longer being signed by Apple.
- 2001USB communication error during restore — the host-side USB chipset returned an unexpected error.
- 2009Device disconnected during restore — same as 4013 family but reported as a USB timeout by the host.