Better to read with OBD or IR? W211 3K91D dump needed

[Bert]

Hello, is better to read EIS by cable or with IR reader?
I have customer with W211, EIS with motorola MC912DC128ACPV maskset 3K91D.
When I tried to calculate password I stuck on locked ELV, even after 30 minutes nothing changed. Car do not unlock steering wheel neither start engine. So I tried to read EIS with VVDI prog and made new key (with hope the original key is somehow damaged). But with no effect.
My ECU technician chcecked EIS and said data are damaged, Also he said that IR reading could be dangerous.
So, is it safer to read cars with OBD cable or IR reader?
Also, can anybody send me EEPROM dump from EIS 2115450608 with Motorola maskset 3K91D?
Thank you very much for advice and files.