Recovery mode / serial data displayed ! keypad inop ????

Of course yes!
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arnova 7 g2 has no volume button..

The Maintenance Mode allows you to query and modify the basic settings of the Star Trac Pro
Stepper.
Engaging Maintenance Mode
Press and hold the0 , 2and OK keys together.
A beep will sound and the “MAINTENANCE MODE” will display momentarily in the information
window.
Release all keys. “SERIAL NO XXXXX” will display in the information window.
Modifying the Maintenance Mode
The following keys are used to modify Maintenance Settings:
Upper and Lower Data Information Window SCROLL keys: Display the next and
previous settings.
Increase and Decrease Level Keys: Adjust the value of the displayed
setting up and down respectively, in increments of 1 unit.
OK Key: Updates (saves) the value of the display setting in the Flash memory, and exits
Maintenance Mode.
The Keypad Test can be used to verify that all keys are functioning on the display assembly.
To engage the Keypad Test
Enter the Maintenance Mode (see Settings – Maintenance Mode).

Press until Keypad Test is displayed in the information window.
Press to enter the Keypad Test.
Press each key on the display. Each time you press a key, the information window will display
which key has been pressed.
To exit the keypad test, press .
If any of the keys do not respond, they may not be functioning and the display keypad must be
replaced.

if u hav missed the data cable u may hav to buy a new one
 the griver pc suit disk can be downloaded from internet in sonyericsson.com

i think after all that you should replaced the mainboard

look in your user manual for this fix. when the battery went dead the deck went into default mode. if this is standard deck for the vehicle it should be in your owners guide. please rate this

The hard drive is bad and you will need to get it replaced. There is a repair service box on this page if you scroll down; just enter your zip code to find a repair service near you.