L322 how to re-write genuine key

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Hello everyone!

If you have read my other thread regarding the problems I had with my key and remote - I managed to isolate the problem.

Turned out the key I was supplied with the vehicle was not proper for the vehicle hence it couldn't sync with the BCM.

I've borrowed my friend's key (which is the later version, thicker one with self charging battery inside) and it paired without a problem.

So I bought two keys off eBay - one is aftermarket blank that is ready to be programmed, and one used genuine. I've read that the used key needs to be erased and brought in "virgin" state in order to be programmed again, so my question is:

Does anyone knows how to do that?

And after that's done does anyone have the full procedure to code them new keys in SDD?

Thanks in advance!