There have some easy steps for solve it....
1) download platform-tools_r33.0.3-windows and Fastboot Driver go through the link
2) Type on Loaction url place "cmd" and hit enter
3) It will open same folder through CMD
4) type "adb devices"
Note! make sure that time your phone in user mode not fastboot mode
5) Then it will show your phone in cmd (Its not showing download and install adb drivers / MTP drivers and usb drivers to your PC links are below)
Xiaomi USB Driver (Mi Drivers): Xiaomi USB Driver (Mi Drivers) updates help your device function more optimally. It allows you to connect your Xiaomi smartphones and tablets to your computer with the help of an external program. It also lets you download or flash Xiaomi Stock Firmware for your...
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How to Install the Xiaomi ADB Driver? Whenever you want to access your Xiaomi device on a PC, you need to use the Xiaomi ADB Driver. This software is a client-server application that acts as a bridge between the computer and the Android apparatus. This software enables you to manage…
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Xiaomi MTP Driver: How to Install the Latest Xiaomi MTP driver on Windows? This is a simple solution that can help you deal with issues related to the device such as when your device encounters some malfunctions due to which it does not work properly. You may have heard about…
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6) after that you confirm it using device manager
7) Then after go to cmd again type "adb reboot fastboot"
8) It will reboot to fastboot mode
9) Type in cmd "fastboot devices" (adb command only work in usermode)
10) Then it will show your phone in cmd (Its not showing download Fastboot Driver above I mentioned)
%% How to install FASTBOOT drivers %%
1) go to computer management
2) find android devie
3) click left click and click update driver
4) Brows in my computer > let me pick drivers > Have Disk >Browse> (select file in fastboot folder "android_winusb" andd hit enter )
Then it will show your phone in cmd fastboot mode
Enjoy it!!
LINK --
https://mega.nz/folder/7QMR0AJS#oS8CHzrAsY3Y0kl9ABBZrQ
More info refer -
https://forum.xda-developers.com/t/phone-not-detecting-in-fastboot-mode-try-this-method.3733642/
