xiaomi.eu ROM is based on China Developer ROM, and there are some differences between the Global ROM and the China ROM, such as the position of the battery percentage.
Did you officially update to MIUI 10? I mean, with the official Xiaomi ROM. If you want to return to MIUI 9, you must flash the MIUI 9 Firmware through XiaoMiFlash and then you can install xiaomi.eu ROM. It is the best way I guess.
Hi! ^_^
I have a Redmi 5 Plus and I am using the lastest weekly build [8.12.27] and I have this issue with the brightness slider:
I love this ROM and I wish you a happy new year <3
Use Orange Fox Recovery, I can use the internal storage with that recovery.
https://forum.xda-developers.com/redmi-note-5/development/official-orangefox-recovery-project-t3807479
I have a Xiaomi Redmi 5 Plus too and I had the same issue and it's not necessary to format data, only flash Orange Fox Recovery:
https://forum.xda-developers.com/redmi-note-5/development/official-orangefox-recovery-project-t3807479