N.B- If you want the firmware "version 5" then you need to flash this below firmware. "Version" 5 is a OTA update which will update "version 4" firmware to "version 5".
1. Install driver ( Video Tutorial Below )
2. Open Flash Tool
3. Open scatter_loading and select scatter file (Walton Rm2 v04 20150608àMT6582 Android scatter)
4. Click Firmware Upgrade then select Download .
5. Remove Sim Card & SD Card From Phone (Very Importent)
6. Then connect USB cable with mobile (mobile must be off)
7. Then start downloading/flashing firmware
8. When it shows Download Ok, it means the installation/flashing firmware is completed.
If This Post help You Please Share and Help Others . Thank You :)