Step 1 back up the mobile phone data before jailbreak, and back up the SHSH.
Choose the firmware of iPhone 4 (5.0.1/9a405) at http://www.weiphone.com/ios,
Start with the following graph.
Step 2 restore the firmware first.
Step 3
Step 4
Step 5: start the first step of jailbreak download redsn0w. You can search for and download redsn0w from Weifeng. Then, follow the steps shown in the figure.
Step 2 of jailbreak
The mobile phone will automatically restart. After restarting, check whether the cydia file exists on the mobile phone. If so, congratulations, you have escaped from jail,
After it is confirmed that the jailbreak has been completed, cydia crash occurs when the 10b1 jailbreak is used. After the 10b3 jailbreak is used, no similar phenomenon has occurred. Of course, it doesn't matter if it appears. There are two ways to solve cydia crash,
1: copy the keyboard folder under/var/mobile/library to/var/root/library.
2: set the system language to English! Then you do not need to copy the keyborad file.
Note: This article Reprinted from: http://bbs.weiphone.com/read-htm-tid-3706118.html