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IOS 11.4 Battery Drain Problem: Does iOS 11.4.1 Fix It?

11 July, 2018, 05:28 | Author: Lydia Fleming
  • FBI agent on a phone

The toggle was notably first seen as the "USB Restricted Mode" in the developer preview betas of iOS 12 and iOS 11.4.1 last month. Security researchers at ElcomSoft point out that connecting a USB accessory inside the 1-hour window restarts the clock.

The feature was created to shield iPhone users against passcode-cracking devices used by law enforcement, essentially immobilizing any attempts at accessing the device after it's been in locked mode for an hour. Significant but not listed: USB Restricted Mode, a change originally included in the iOS 12 beta that makes it more hard for anyone, including authorities, to break into the iPhone through the Lightning port. "Importantly, this only helps if the iPhone has still not entered USB Restricted Mode", Afonin commented.

The latest update to iOS introduces a new USB Restricted Mode which is supposed to prevent the Lightning port of an iPhone or iPad being used to transfer data an hour after the device is locked. Apple says that it added USB Restricted Mode to iOS to increase device security against a known means of hacking, which notably has been used by law enforcement personnel to extract the contents of criminal suspects' phones without their permission. "Theoretically, iOS could remember which devices were connected to the iPhone, and only allow those accessories to establish connectivity without requiring an unlock - but that's about all we can think of". If you want finalized software, iOS 11.4.1 is the one you need, which Apple made available earlier this week. This can be done by plugging any USB accessory into the iPhone's Lightning port.


A GrayKey box for unlocking Apple mobile devices. The researchers suspect this is a bug in iOS, so Apple could fix it with another update.

CoolStar has announced that the Electra jailbreak works on iOS 11.4b3 and has advised all users on a higher firmware version to downgrade while they still can! However, Apple had not released the details on its security page at the time of this posting, but expect them to appear sometime soon. Users can also manually enable USB Restricted Mode by triggering the SOS mode-holding an iPhone's sleep/wake button and either volume button.

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