Citroen C5 NG4 Beeping after unit change

[micost]

Hi friends,
i have problem with NG4 from citroen.
I must change unit, buy second one.
I installed and all works, but is BEEPING
I check with diagtool that vin is different but i cant write vin because there is no option
Thx for any help
Regards

[PSAcars]

Hello to all. You have to change vin with diagbox.