Update Mi5 to Android 7 Custom ROM without wipe

Below you'll find the right and most stable way on how to install 6.12.x custom or international Android 7 ROM on your Xiaomi device. Do not forget to charge your device before flashing! It's recommended to have 100% fully charged device. This was tested on 6.11.0 by xiaomi.eu updating to 6.12.15 by xiaomi.eu custom ROM.

1. Backup your apps and data (without system backup) with Titanium Backup app.
2. In case you don't have 6.11.0 ROM installed, first you'll need to flash 6.11.10 by xiaomi.eu or other same version custom ROM.
3. Note! With 6.11.10 by xiaomi.eu ROM you'll automatically have TWRP 3.0.2-2 installed.
4. We will update TWRP recovery to newest version twrp-3.0.2-3-gemini.img
5. Enter TWRP
6. Copy twrp-3.0.2-3-gemini.img to phone memory.
7. Press "Install" > "Install img".
8. Select TWRP .img file.
9. Swipe and select "recovery".
10. Swipe to continue.
11. Note! Now get back to "Reboot into recovery" and device will boot in just installed TWRP recovery.
12. From freshly installed TWRP wipe "Dalvik/ART Cache, Cache". Remove all other checkmarks! Select only "Dalvik/ART Cache, Cache".
13. Now you can install 6.12.х by xiaomi.eu or newer version. Also you can now easily install any other Android 7.x custom ROM