Download the lollipop stock ROM ,save it to the root directory of your SD-Card and follow the instructions below:
- Boot into recovery menu by pressing and holding the vol+ and power button together
- When in recovery mode, choose Apply update from SD-Card
- Select the downloaded file file and choose yes.
When the installation process is complete, reboot your phone by clicking the reboot system now and there you have it. Please note, as earlier said, this stock ROM leaves your device not being able to receive OTA update.
