Hi. Backup you data > download and reload the firmware pack here as per the foregoing steps:
- Download and extract to access a file named 'UPDATE.APP"
- Create a new folder on you SD card and name it: dload
- Copy the 'UPDATE.APP' file to the dload folder
- Insert the SD card onto the G525
- Ensure the phone is powered off
- Press and hold: Vol Up + Vol Down + Power until the phone lights up and the installation begins