Sprinter Customer Specific Speed Help

After many hours on forums unfortunately I did not find any good answer. There are many people looking for this answer and some know how to do it, but no good how to explanation.  I am working on a sprinter with customer specific speed set (see picture). I already changed the Vmax and HGB VAN values to highest, but the customer specific speed still don't change. Does anyone know how to change it without going to the dealership? Thank you in advance.

After many hours on forums unfortunately I did not find any good answer. There are many people looking for this answer and some know how to do it, but no good how to explanation.  I am working on a sprinter with customer specific speed set (see picture). I already changed the Vmax and HGB VAN values to highest, but the customer specific speed still don't change. Does anyone know how to change it without going to the delete? Thank you in advance.

What ECU does your van have? CR43?

After many hours on forums unfortunately I did not find any good answer. There are many people looking for this answer and some know how to do it, but no good how to explanation.  I am working on a sprinter with customer specific speed set (see picture). I already changed the Vmax and HGB VAN values to highest, but the customer specific speed still don't change. Does anyone know how to change it without going to the delete? Thank you in advance.

What ECU does your van have? CR43?

Yes, CR43. This one does not have CPC module. I know the 907 models with CPC are much easier, but this one seems to be harder, at least for a newbie like me.

Thank you perchikd! He was about to help me remotely.

Identifier C1 05 needs to be modified on CR43 and on CR60 identifier 03 36 needs to be modified, for former FedEx and other fleet W906 sprinters. If you need to go faster than 82mph, the firmware of the ECU needs to be modified. I can help you with that too.