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Anonymous users2024-01-24Let's take the photo speed. and then help you analyze. There's really no way to say one or two without a picture.
The new one has a hole, and it's not a regular circle, or if it's a regular one, someone deliberately keeps it, and it's used to install a lock.
Add some oil, and if it doesn't work, call the door lock unit to repair it, otherwise it will be troublesome if it gets stuck that day!!
1. Factory initialization.
Press the touch button on the motherboard, and when you hear the prompt "Enter Initialization", start initialization, and there will be a prompt sound when the initialization is completed. >>>More
2. It is lined with a layer of gauze, which is generally made of stainless steel and stainless iron, of course, it is better to be made of stainless steel. In fact, there is not much difference between the current security doors, mainly in the brand and plate (the national standard has regulations) to confirm that it is good. You can search for the specific national standard: >>>More
The situation that the protective film on the security door is aged and needs to be removed can be solved in different ways: >>>More