Guys I have tried to update to the 4.0 Hybrid but when I select the update by SD/MMC (FORMAT) then push reset for 5 secs it just boots the system up normally and not into testmode?!

If I do not push reset and just leave it then a message in red comes up at the bottom of the screen saying "update by SD/MMC (FORMAT) has failed

Can anyone please assist?

After doing service mode part need to eject SD card and put test mode files on it. And delete wince images

Ok I have now updated the unit.

I have the following problems....

The navigation voice is a US male, how can I change to a UK voice?

Also my iPhone 4s on iOS 5.1.1 is crashing my unit, after the iPhone is connected if I press any other button like menu or map it will just freeze my system???

This is most likely an iPhone issue not an avic issue.

You will have to grab the voice_tts files out of your back up I believe and place them in the appropriate folders. The base files used for this was a US avic so you get UC voice files. You'd need to replace Samantha with who ever you want from UK