First Make a Backup all data will be deleted and you will start fresh!!!!!!!
After that download this firmware for EU LYA-L29 C432: https://androidhost.ru/T83
If you have LYA-L09 :https://androidhost.ru/T82
After That extract the firmware and put in a usb stick ( no need to creat dload folder already exist in unzipped folder)
Mount an otg usb to your phone then the usb drive
Then dial in phone *#*#2846579#*#* and go to Software Update and then select usb upgrade.
Have a nice upgrade!!!!