Regarding the latest update:
Many users on 4PDA also have problems with the update, the reasons are not clear. and what's more, there are more people who have successfully updated themselves.
One of the reasons for this behavior may be interference with the system by the android seller.
Collectively, you can search for the cause for a long time, but the fact is that there is no fault in the OTA ,because the update is installed on most smartphones ... but about 20% were faced with the problem of updating
Check my theory is easy:
Who has problems with OTA, reinstall the software on your device using the flash driver
SP Flash Tool V5.18 Then try installing the OTA update again.
link to firmware: https://mega.nz/#!oZsS2CyR!45sOM05i6zp5ekFLaXvSXcKdAYGClIovWybzbnRTtRk
write about the results here
Also posting a link to the latest update in the form of firmware under
SP Flash Tool V5.18
link to firmware: https://mega.nz/#!9ddGgSxC!LhfoieMZyenpVxriM5Kadd0Ek4FCotIZJ9NB9RhO_qs
Sorry for my English, I use online translator
I trust the administration to correct my post ,so that for all it was clear that I wrote