Chapter in this post:
Today a little guide to the topic "DFU mode" for the iPhone. DFU mode is a boot mode in which the iPhone crashes very early after starting and remains in a maintenance mode. This is helpful, for example, if you want to install older firmware on it using SHSH or if you want to transfer the iPhone with an old backup. DFU stands for "Device Firmware Update".
If you have connected an iPhone in DFU mode to the Mac via USB cable and then start iTunes, iTunes only receives a short ping that an iPhone is in DFU mode on the computer.
Switching the DFU mode on and off may also be of interest to people who have jailbroken their iPhone so that it no longer boots properly and hangs. If it is in DFU mode, you can possibly restore it via iTunes or you can play along with it TinyUmbrella SHSH files or other firmware.
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.