v50 2008 immobiliser problem
 

Hello. Can anyone help i have a v50 2l diesel. Just had flat battery couple of times. Today i bought new battery(120£} and now car doesn't start. In dash board i get immobiliser try start again error. On vida dice first diagnose came with immobiliser not ok. After half hour trying diferent things now i get ecm module signal missing. Any one any ideas. Pls help car is vital. Can ECM just go out of the blue or immobiliser? any quick sollution to reset every thing. Tried locking 5 times and etc. Tried second key also...same thing. Tried jumps tarting

Don't think is immobilise. Last time i had flat battey got same error "immobiliser try start again". Don't really have money for dealer so maybe someone has any ideas. Also steering unlocks in vida diagnose immobiliser reads key. Says key ok ecm signal missing error code ecm c326