OTA update fails

[aere]

I installed UT on my Xiaomi Redmi 4x six months ago, without any problem.
At that time version 14 was the stable one.
After two weeks phone updated to ota15, without problem.
With OTA 16 happened this: the system tried to update to version 4 but didn't be able to finish update, with error message.
Now, if I try to update to ota 17 (phone is still at version 15) the update start to download version 5 and stop during download with error message.
Do anyone have this problem?
Could be a problem of this phone, redmi 4x, or it could be other?

[Keneda]

@aere
What is the error message ?

[aere]

@keneda, see here below


[aere]

@keneda
FileNotFoundError:http//system-image.ubports.com/pool/ubports-cd.......
......tar.xz