Nubia Z7 mini. Can't mount sd0 after build.prop was edited - ZTE Z7, Z7 Max, Z7 Mini

Hi!
First of all. Nubia Z7 mini with stock rom 1.7X version (don't recall the last number). The phone was repartitioned and it was working without issues from 1 year ago.
I was trying to solve the youtube app issue ("Can't connect to server. Tap to try again") and following a tutorial I edited the build.prop file to change the release.version number from 4.4.2 to 5.0
To do that I made a backup copy of the original file into a folder of external sdcard. Then I copied another time the file with name build.prop.back in the /system directory, edited the original and tried to restart. System is not loading. Nubia logo appears and then disappears. The phone is on (the driver partition mounts and appears in the pc file explorer) but it displays nothing on the screen.
Tried from CWM 6.0.5 to revert the changes but i get error "Sd0 can't be mounted". So I cannot change the file nor restore a backup from external sdcard. Pc file explorer shows two volumes that can't be accessed because "no media is inserted". I guess it is because volumes are not mounted from the phone. I tried also to start the phone without the external sdcard (in case it was the backup of the file the cause of the issue) and it didn't work either.
What can I do? Thanks in advance.

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