Chapter in this post:
If you want to unlock your iPhone, i.e. get from the lock screen to the home screen, you have various options: Face ID, Touch ID and unlock code. The latter is probably made up of four or six digits for you. This is reasonably safe in everyday life, but can still be cracked relatively quickly in a brute force attack. With regard to the current Checkm8 malware, an iPhone boot ROM exploit, an alphanumeric code is recommended. The iPhone PIN with letters and numbers makes it harder to guess what input needed to access the stored data. Here you can find out how to set such a code.
To change the iPhone code, you need to know about the current combination. Remember: the whole thing has nothing to do with your SIM card PIN. It remains unaffected by the changes described below. So if you have your four or six-digit code ready, you can use the following steps to make your Apple smartphone more secure:
Instructions as video: See Apple help here
Here are a few screenshots (iPhone X with iOS 13) that show you how the process can look on your display. So if you get stuck with any of the above, you can find help here to keep going. So you can set an alphanumeric iPhone code without any problems and, in addition to numbers, also use letters in small and large for iPhone access.
At the beginning I already have the relatively new jailbreak malware Checkm8 addressed that too Apollo or Moonshine is called. This can affect Apple smartphones that have an A11 chip or a previous version. So among others the iPhone X, the iPhone 8 and the previous generations around the iPhone 7, 6S, SE and Co. devices with A12-Chip and A13-Chip (XS, XR, 11, 11 Pro) got a patch and are safe from the malware.
Checkm8 is, a "Trail of Bits Blog" post after to an iPhone boot ROM exploit. The software can boot the iPhone, and that with its own software - theoretically also with Android or other operating systems. The good news: it is a “tethered jailbreak”, an attack that only works with a cable (iPhone connected to a Mac or PC via USB). More information in the linked post.
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Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.