The following cases are for reference only.

Question 1:

A while ago, my friend's mobile phone suddenly crashed in the middle of playing games, and the battery was buckled, but it could still be turned on. Another time, I changed my SIM card, but I couldn't boot it after installing another SIM card. The reason is not clear, but it has crashed many times. It may be a ROM or battery problem.

Solution:

Unplug the battery and charge it for about 10 minutes. Do not install the battery in other mobile phones. Press and hold the power button for 2 minutes (discharge static electricity), then install a fully charged battery, and you can start the machine.

Question 2:

Once I brushed the computer with 4.0 and forgot to upgrade the firmware, I restarted it indefinitely, and then the battery was deducted. Shit, I can't start the computer again. I tried the solution to the above problem, but it didn't work. JS said that the font was broken 1500 RMB, and the capacitor was dead by 900 RMB. What a fucking lie. Then I did it myself, but it didn't work for a few days.

Solution:

Remove the battery and leave it for 2 days. Once installed, it can be used.