So my recommendation after reading tons of articles is to follow this video.
https://www.youtube.com/watch?v=j27x5iJSS40
Essentially there are 2 ways how to move from a custom/vendor ROM to xiaomi.eu ROM. The method which is being used here in the video is to use the Chinese version of PC Suite and the recovery ROM.
- The video assumes the device is bricked but if it is not then it is enough just to turn the device into a recovery mode and use a (recovery) rom. To sum up, “flashing recovery ROM using Chinese version of Mi PC Suite in recovery mode.”
- Once done the second step is to unlock bootloader. Again the Chinese version helps. But this time I had to click twice, to unlock it.
- Download TWRP by cofface and follow its guidelines. End TWRP with “fastboot reboot” from command line.
- Lastly flash EU ROM using this.
- WIN
Other links:
https://xiaomi.eu/community/threads/who-has-redmi-4-pro-from-gearbest.36365/
https://xiaomi.eu/community/threads/miui-eu-rom-for-redmi-4-pro.36165/page-2
Redmi 4/Prime/4A thread: http://en.miui.com/forum-119-1.html
Tools: http://en.miui.com/type-119-995.html
Rom: http://en.miui.com/type-119-998.html
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[MIUI DEVICE TEAM] Flash / Unbrick Redmi 4/Prime/4A: http://en.miui.com/thread-408889-1-1.html
Bootloader Unlock – Solution for Redmi 4 Pro/Prime (unlocking stuck at 50%): http://en.miui.com/thread-429397-1-1.html
RedMi 4 Prime/Pro Twrp recovery: http://en.miui.com/thread-412204-1-1.html
http://en.miui.com/forum.php?mod=viewthread&tid=92720
Stable & Dev Rom: http://en.miui.com/download-320.html