No need, you just have to unlock your bootloader, then boot into fastboot, connect the phone to your laptop/pc. then double click on the bat file to run the fastboot installation script in the rom zip file after you extract it. You can follow the full guide here:
Thank you very much for the given hints/support, i will try this and then report the results here.Idk, you're making yourself so confuse while it's such a simple thing.
You want xiaomi.eu, right? So.
Download this rom - Xiaomi.Eu - Rom & flash it via fastboot. U just need to go to fastboot on mobile and use the windows_fastboot_first_install_with_data_format.bat, or if u have mac, use the mac one, or the linux one.
It will flash it automatically, just let it do the work.
After booting, set up the pattern lock, the swiping line thing one, after that go to fastboot again, and on your PC type:
fastboot boot twrp.img (if u type fastboot boot and hold & drag the twrp.img file to the cmd tab, it will automatically "write" the location of the file) - use this one twrp.img - PC
It will sucessfully boot into twrp, and then u will flash the twrp.img in your phone, u choose the twrp.img and u flash it to "install recovery ramdisk" - flash this img in twrp, so u stick with twrp - Twrp.img - flash on mobile while on twrp
After that, u can flash this update/ota in twrp, the miui 12.5.3 - 12.5.3 miui - flash on twrp
Done, u have your phone updated and with xiaomi.eu rom flashed.