Hello Xiaomi.eu,
The latest version of the recovery is available here:
https://mega.nz/#!Z5FXCAxY!iL85IOutv63kkTKL6dzZy-By21LBx0vujI0CZ9xMwy8
How to Install:
1. Open the command line
2. Connect the phone
3. Boot to fastboot adb reboot bootloader
4. Execute: fastboot flash recovery...
Found couple of bugs on Mi 8 PRO (UD) equuleus:
* Bluetooth stutters while connected to car stereo via the SBS codec
* Google Voice Assistant is not working for EN-US (the switch is there but when pressed does nothing)
I've used Fedora. Furthermore, even in Windows it should at least show a detected device, which it doesn't.
When I turn on the USB Mounting option nothing happens...
I've found a critical bug: After installation of 3.3.22 on Mi2 the microphone levels doesn't adjust properly leading to poor recording volume.
I suggest sticking with 3.3.15 for now.