Step1. When you reboot your iPhone, iPad or iPod Touch after installing Yalu Jailbreak, you will be at your usual lock screen. Unlock your device as you would normally and go to the home screen that has the mach_portal/Yalu app on it.
Step2. Just as you would with any other app, launch mach_portal/Yalu app.
Step3. Now, because the jailbreak is currently in beta, you won’t be presented with a top-notch user experience. Instead, you will see a blank display screen aka a white screen , this covers up the fact that the jailbreak app is doing what it should do and re jailbreaking your iOS device.
Step4. Leave it for about 15 seconds or so without touching your device and the screen should shut down; your device will now be back on your home screen.
That is all you have to do. Simply launch Cydia like you would with any other jailbreak and it should all work properly. Head back into Cydia and download all your favorite apps and packages, making your first one Cydia Eraser. This is an important tool because it will allow you to strip the jailbreak off your device without losing your iOS version.
If Cydia continually crash, please back to the Home screen, it will mean that your device has not successfully gone through the re-jailbreak process. Simply repeat the above steps, in the order they are written and it should all work okay.
Hopefully, you will have no trouble with the above steps and should be able to use your jailbreak again.