I have F90BT, which was was installed with hardware handbrake bypass.

From the very first time, I installed it, I was getting message "improper connection of brake wire...".

And under AV Settings button MUTE/Guide is grayed out, set to MUTE, so every time I use navigation functions, my sound is muted for Turn-by-turn directions.

Is there any method to change MUTE/Guide button to "Lowering the sound" or "continues playback during directions"???

Is is info stored somewere in DATA.zip?

Hit "off" in the source menu first then choose "ATT" under the mute/guide button. Read your owner's manual and use the search feature here before posting to the forums.

thank you, cmh928, my bad...