Got bmw wiv toad alarm on battery went in thob put new battery in now dont work it does al my electrics

a lot of new bmw needs programming when install a new battery.

new battery need to programmed with the car's ecu

Disconnect the battery, have the ignition key turned to the "on" position then reconnect the battery.

MAKE SURE CAR DONT HAVE A ALARM.WHEN YOU HAVE A AFTER MARKET ALARM AND BATTERY GOES DEAD OR IS DISCONNECTED,SOMETIMES IT ARMS ITSELF N WILL NOT CRANK.

For starters you can unflatten the battery!

get the side cutters out and remove it ,they go wrong and cause no end of problems

your alarm system causing problem

check the ground wire

disconect the alarm and see if it will start

Just a possibility, but a discharged battery could be the culprit. Do the headlights come on brightly? Will the horn blow normally? A 'dead' battery will usually have enough power to illuminate LED warning lights, while not having enough current to operate the starter/door solenoids, etc. Have somebody test the battery voltage to be sure.