Axor Telligent Gearbox

Hi All, hope someone can help?
Axor 1824 2011 Telligent Auto box (no clutch pedal), batteries went flat, replaced and now won’t go into gear.
Merc say bring it in! Won’t move, is there a way to reset after battery change, tried the Powershift procedure but nothing.

Thanks

Is the powershift, when you start the engine whilst holding both buttons in, keeping hold of them util the alternating M A lights stop flashing, in order to reset the gearbox?