Changes with the 8GB model

My first model was the 4GB version, my current model is the 8GB version, there were some changes on the firmware.
The /system (system.img) which was a read-only CRAMFS  image, is now an ext3 file-system, mounted read-only, making it easier to modify without replacing the stock ROM.
As a downside BQ does not provide yet a downloadable version of the stock firmware for this newer version, I am currently working to retrieve it from my current device so I can revert to it in case something goes wrong.