UEFI, BIOS and how not to harm the laptop?

Question

BIOS

Welcome all.
The following situation happened in my life: Windows 7 was installed on a Lenovo Z580 laptop - 32-bit, but the laptop had 4 GB of RAM. I, as a very smart person, after reading the forums, decided to change the system to Windows 10 x64.
When installing a dozen, she said that it would not be installed on the MBR, and you need to change everything to GPT, which I actually did, having erased all the information from the disk before (digging into diskpart).
Windu installed, but a little later something went wrong and Windows crashed on boot. I decided to reinstall the system again, since there was little point in restoring, but when I tried to enter the BIOS, I didn’t get anything, the computer just continued to load Windows and I couldn’t do anything, I took it to the workshop. There, when I was already picking up the laptop, I asked about my problem, and the person who repaired the laptop replied that something had happened to UEFI.
I ask you everything, after reading the information about all the incomprehensible words.
I don't have more information, sorry.
Actually, my questions are:
1. How to prevent UEFI removal?
2. How to restore UEFI if it was removed in any way?
3. Have I judged correctly on the questions or am I going in the wrong direction at all?
PS I apologize for, perhaps, the dumbest questions, I looked in Google, but there are only descriptions of UEFI, specifically for its restoration, I'm not sure if I'm reading it or not.
If you can't answer, please give me a link to an article that will point out my problems.
Thank you.

Answer 1

There, when I was already picking up the laptop, I asked about my problem, and the person who repaired the laptop replied that something had happened to UEFI.

Did the BIOS settings fly off and Legacy was enabled, not UEFI? Or vice versa?
How did you try to get into bios? Bios or boot order? What was expressed by "nothing came out"?

Answer 2

In this situation, I would act with the old proven methods.

Windows 7 was installed on a Lenovo Z580 laptop - 32-bit, but the laptop has 4 GB of RAM.

If there is a desire to install x64, then it was necessary to change x32 to x64 before the update. If (as I understand it) you have a sticker with a license key, then try installing a clean Win7 x64 of the same version (i.e. Home, or Pro, or ...) and slip your key on it. Must accept. After that, you can start updating to Win10, it should come with the same version. If there is no sticker, you need to remove the key from Windows with specially trained utilities.

When installing, a dozen said that it would not be installed on the MBR, and you need to change everything to GPT,

This is not entirely true. More precisely, not at all - I have two home computers running on the "top ten" with disks marked in MBR and without UEFI. I installed it on both via an update from Win7, which is more relaxed about the MBR. I suppose you can find ways to directly install Win10 on a non-GPT disk .

1. How to prevent UEFI removal?

Do not disable it in the BIOS, and that's it. In fact, I would prefer in this situation, on the contrary, disable UEFI. And if you also have a disk marked in GPT, then convert it to the good old MBR (this is the question of "old proven methods").

2. How to restore UEFI if it was removed in any way?

Likewise, enable it in the BIOS. In my opinion, this is not necessary.