Lonsdor K518ISE Audi A4 2009 BCM2 Undefined Error Response 80?

Audi a4 2009 bcm2, one working key. Lonsdor K518ISE Immo data read success, make dealer key success, programming fail. After that car won’t start. The problem only exists when trying to program more than one key. Lonsdor losing communication. Autel program one key, vvdi2 coming with security access fault. All tools reprogram the original key without a problem. Any ideas? Thanks.



Most likely wrong key or damaged.

Must use 8T0 959 754D for 868Mhz if car does not have keyless. I’ve been struggling with Chinese keys and I’m using original keys which i’m virginising before programming.
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