Back to weekly xiaomi.eu rom from LineageOS 17

[sluTTY]

I tried LineageOS 17 on my Mi6 from here: https://forum.xda-developers.com/mi-6/development/10-0-lineageos-17-0-mi-6-t3965975
Now I want back to the weekly rom from xiaomi.eu.

How do I do that?
Just flash the proper TWRP and then flash the rom?

Thanks

 

[esselunga]

Just wipe dalvik/art cache, cache, data and system from your twrp, then flash the rom.

 

[sluTTY]

I did exactly that now I am staring at the boot screen (MI logo in the middle, Powered by android with three dots at the bottom) since 20 minutes.
After flashing the rom TWRP said "No OS installed, sure you want to reboot?". Seems TWRP was right.
What now?

 

[esselunga]

Did you check the logs after flashing the rom? Did it say something went wrong?
(And also: did you perform a complete backup before installing the rom?)

 

[sluTTY]

No, no and no.
The solution was to not only wipe data but to format it.