Apple's 4S mobile phone has an unknown error in itunes display during jailbreak-1; Failed to extract the random number of baseband chip with AISI brush; Seek remote repair

First, it is recommended to use iTools to back up all data (address book, SMS, software, etc.). ).

Second, then enter DFU mode to brush the machine, and then use iTools to restore the backup (address book, SMS, software, etc. ).

Third, DFU brush mode (black screen)

1. Connect the iPhone to the computer with a USB cable, and then you will hear the prompt that the computer is connected successfully.

2. Please turn off the iPhone first, and then you will hear the prompt that the computer connection is unsuccessful.

3. Now press and hold the power button for 3 seconds, and then continue to press and hold the On/Key and Home button at the same time until the first 10 second. Please immediately release the On/Off button and continue to press and hold the Home button until you see that the USB device is in DFU state, and then enter DFU mode.

4. At this time, iTunes will automatically start and prompt for recovery mode (iPhone will always be black). Then you can press and hold the shift key on the keyboard, click "Restore" and select the corresponding firmware to restore.

I hope this helps.