Hello Litera, that's right, you don't need to insert the sim-card. You have to:
1. download and install the Mi unlock tool. With this and your Mi-account (if you don't have a Mi-account, you will have to register) you must "ask permission" Xiaomi for unlocking your Mi5s. If you are quite new (and for example don't have much 'Xiaomi points' here on the site / account) you must wait for Xiaomi sending you a message that you have permission. Otherwise you will have persmission immediately. I could unlock immediately.
2. when unlocking is done you have to download and install TWRP.zip on your PC.
3. download wanted rom (beta 6.11.10 capricorn is latest) on your PC.
(I create a folder "Xiaomi" in C and worked from there. I put adb drivers, twrp and rom in the folder)
N.B. you must have twrp.img in the twrp.zip. You must see it after extracting the twrp.zip
- set Debugging permission on in setting of your device. To do so first tap 7 times on Miui rom in "about phone", this will make you a developper of your device. Go to developper options in additional settings and search for debugging....enable it.
- connect your Mi5s (it must be on in normal working mode) to your PC. Check if your PC recognize your Mi5s, it should be in the explorer.
- open Windows Cmd as administrator in device manager of PC (click windows logo, next to Alt, + x)
- typ "cd C:\Xiaomi" "and enter (this will open your Xiaomi folder)
- typ "adb devices and enter (this will show your serialnumber of your device)
- typ "adb reboot bootloader" (this will turn your device into fastboot)
- typ "fastboot recovery flash twrp.img" (this will install twrp on your device)
- typ "fastboot reboot" (till it finishes)
Disconnect your device.
Turn your device on in recovery mode (volume+ and power button)
Then you will see TWRP.
Go to wipe and wipe data, cache and dalvik.
Reboot.
Turn your device on and connect it to your PC
Drag the rom to your internal storage.
Disconnect from PC.
Go to updater app and let your device search for updates. They are not there. Go to the 3 dots above on the right side. Click on them and click "choose update package".
Then search for the rom (zip) and choose it. Click ok.
TWRP will install the rom.
Let it run the whole time. Your device will turn hot. Let it be. (mine installed 4 times, i put it out and on again and it was ok fortunately)
I think that's it.
Also read:
https://xiaomi.eu/community/threads...w-to-flash-xiaomi-eu-roms-on-your-mi5s.36132/
ZenXXII wrote this guide and helped me a lot. Also others helped me a lot.
So ask if you have questions and we will help you!
Good luck Xiaomi friend !!!
Alex