Downgrade from 6.0.4 to 6.0.3
-Download the files you find here
-Unzip and get the file .lgu in USB flash drive (I recommend it, format it to FAT32 else is not recognized)
-Install it in medianav as any update.
Downgrade from 7.0.5 or 8.0.5 to 6.0.3
- Download the files you find here
- Unzip and get the file .lgu in usb flash drive (fat32 formatted)
- install it in medianav as any update