- Update iTunes
- Backup iDevice with iTunes
- Backup iBooks and ringtones manually
- Keep iDevice connected to computer and go into dfu mode (home and sleep buttons until black screen)
- Update iDevice in dfu mode
- Do not restore backup yet
- Jailbreak iDevice
- Run Cydia once to make space to OS partition
- Restore data from backup using iTunes
- Add Cydia tweaks
If an app crashes on launch, you can try to fix it with Link Identity Editor:
ldid -S Program
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