✔ 最佳答案
All procedures have been strictly followed, but still the screen freezes at the language select menu after the power is on. It will not work even though I try all the buttons, and turn the power on and off while rotating the lock. You may refer to this video for more details: xxxx.
So I would like to ask whether you could contact UPS for insurance claims or any other possible compensations? And if the equipment is still not functioning, I am afraid that I would have no choice but to return it and demand a refund from you.