Dear
@darki. I am very sorry to have misread/misunderstood your question. I understood that you are on Global Stable ROM and executing my procedure from my previous comment would just overwrite your ROM and in this case your data/pictures/contacts etc. will
not be erased! But now i understand that you are on different ROM (in this case Xioami.EU). In this case you replace your current ROM with Global Stable your data/pictures/contacts etc.
will be erased! I've experienced several minor problems (like failure of the camera, quick charging etc.) at several different Xiaomi devices and overwriting the existing ROM (with the same and latest ROM) was the easiest way to remove those problems, but there is no guarantee that it will always work. To tell you the truth I've never overwritten an existing Xiaomi.EU with the latest version of the same ROM to try and remove such minor problems (like camera, quick charge etc.), because I prefer official global stable (of course I root them always), but i strongly believe that it cannot be different from Stable ROM to Stable ROM. Since you are on Xiaomi.EU, you can try one of these 2 procedures:
+ enter recovery mode and (via TWRP) make e copy of your smartphone into your computer
or
+ root your device (if not already rooted) and install Titanium Backup App, make a copy of your smartphone to you laptop
Try then to overwrite you existing ROM with the same ROM like explained in my previous email.
If overwriting via Updater does not work then enter TWRP, do a wipe of your device (but do not delete the internal storage) and reinstall the same ROM. You can re-create the contacts etc. via Titanium.
For later:
If this doe not work then pls let me know and I can guide you through the procedure of replacing (in recovery mode) your Xiaomi.EU ROM with Xiaomi Dev ROM then again replacing Xiaomi Dev ROM with Xiaomi.EU, but in this case I'm note sure if your data/pictures/contacts etc. will be erased. It might also happen that Xiaomi Dev ROM might relock your bootloader. At least that was the case with My former Mi5s.