After some personal tests and researches, I present you here some solutions categorized by issue causes. Follow these solutions in the order they are listed in the passage and your problem will be solved.
1. Hard Reset
In case your iPad falls into a reboot loop, try hard reset to interrupt the rebooting process. To force your iPad to restart, hold the home button and the on/off button at the same time until the screen blackens and then shows an apple logo. With good luck, the iPad would return to normal again.
2. Try to Recover the iOS System
I do hope that the previous suggestio