2013 mk2 c4 grand picasso not turning after battery change

[David c4]

Hi guys I am new to the forum but I am in desperate need of help, my battery went dead on my c4 grand picasso 1.6hdi mk2 2013, I have replaced the battery and everything works the dash lights up but when I go to start the car there's nothing, the engine will not turn over. When I take the keys out the ignition it beeps around 10 times at me, the car was fine with no issues prior to the battery going flat, can anyone help me out many thanks

[GiveMeABreak]

Follow this guide to properly reset the BSI and initialise the fobs:

BSI Reset / Battery Disconnect / Reconnect Procedure