Q: How do I reset the iPad Pro 9.7" Imbedded SIM prior to resale?

I have used my iPad Pro 9.7 with several cellular carriers.

I have cancelled the plans.

I want to resell the iPad Pro 9.7 but want to make sure there is no

residual information stored in the Imbedded Apple SIM.

How do I totally reset the Imbedded Apple SIM so the new owner can choose

any of the available carriers without any problems?

I can't just get a new one as the Apple SIM on the iPad Pro 9.7 is not removable.