So, I can suggest what I did:
I installed first the TWRP recovery. From it, I installed xiaomi.eu_multi_cancro_6.5.26_v7-6.0. Then, I let the phone booting.
Let's go back to TWRP recovery, full wipe + again installation of this version. Then, again, phone booting (yes, it's boring !)
And a last...