There could be several reasons why your Huawei MediaPad T3 7 keeps shutting off and turning back on. Here are a few troubleshooting steps you can try:
Charge the device fully: It's possible that the device's battery is low, causing it to shut off and turn back on. Try charging the device fully before turning it on.
Boot into Safe Mode: Booting into safe mode can help you determine if the problem is caused by a third-party app. To boot into safe mode, press and hold the power button until you see the Huawei logo. Then, press and hold the Volume Down button until the device boots into safe mode.
Perform a factory reset: If the problem persists, you may need to perform a factory reset to eliminate any software issues. Before doing so, be sure to backup your data to avoid losing it. To perform a factory reset, go to Settings > System > Reset > Factory data reset.
Contact Huawei support: If the above steps do not solve the problem, it may be a hardware issue. In this case, you should contact Huawei support or bring the device to a certified repair center for further assistance.
Unfortunately it sounds like the phone is stolen and has been SIM Locked by the Telco that still owns it under an undischarged contract, or if bought outright, the owner has asked the Telco to lock it so no one else will get the benefit of their loss. I bet the seller will suddenly vanish and you won't be able to contact them. It is a $1,200 phone!
This explains
https://www.fixya.com/support/r26056685-phone_asking_puk_codehttps://www.google.com/search?q=Huawei+Nova+5T
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In a photo editor like photo shop. Be aware even after enlarging a photo, it will not have more info. Small pictures have little info, and will be blurred when enlarged.
Use either of the following methods to restore factory settings for Huawei HN8546X6:
1. Choose System Tools > Restore Default Configuration from the main menu on the web page and click Restore Default Configuration.
2. Hold down the RESET button for a long period of time (longer than 10s) to restart the Huawei HN8546X6 with factory settings.
Here is the source link get the unlock code for huawei-lyo-l02
https://www.unlockninja.com/unlock-huawei+lyo-l02
Just go to the link and make your selection for country and network and apply for unlock code.
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Use either of the following methods to restore factory settings for Huawei EG8145V5:
1. Choose System Tools > Restore Default Configuration from the main menu on the web page and click Restore Default Configuration.
2. Hold down the RESET button for a long period of time (longer than 10s) to restart the Huawei EG8145V5 with factory settings.