So the key/immobiliser system is working then.
When you say , it came up crank sensor fault, the original and the new one both gave the same fault, you wont get the spark at the spark plugs if the
can not read the signal from the crank sensor.
Did your friend try and clear the fault, but it would not clear?
Did you take the battery off to charge, or just disconnected the earth lead and charged on the car?
Next to the battery, you will see a fuse box , check one has not blown or a dirty connection, take the fuses out one at a time, [ unless you can take a photo of the fuse box and use the photo for reference purposes ]
Keep us informed
It is at times easier to start a new thread, you will get a lot more replies,