Pmc1980

I plugged my icarsoft diag machine to try to code the battery but it comes up "function not supported " I will try it with the launch machine at mu work, as for the last fluid change I don't know when if ever it has been changed

Help plz, just bought an 06 plate a6, 2.7tdi quatro, the guy I bought it from said he renewed the battery but did not code it in with a diag machine, the mmi now doesn't work if u switch it on it comes up with the audi logo for about 30 secs then flashes a message about a component not being supported and switches straight off, any advice on how to fix this? Also it flashed up on screen that bulbs are not working but I check and they are. And 1 last thing when driving if I accelerate quickly it locks into 3rd gear I need to pull over switch car off and on again, he said the filter in the gearbox is clogged up and supplied 10 litres of cvt atf and a new filter and gasket saying this should sort it, just looking to see if he is right or just said that to get me to buy it? Any advice much appreciated