Done 2019 VW POLO MQB 49/5C add key success today.
The Xhorse vvdi key tool plus pad was used throughout the process.
Add key mqb platform (Johnson cluster and new MQB49/5C type on key tool plus are online. Read data with key tool plus pad, then sent it for online calculation(cost 1 token-must be charged before).
You have to use a token to add a spare key from the working key.
After 3 minutes I got immo data file which was automatically saved into the device. After that, you make a dealer key (use xhorse proxy MQB style) and program to the car as usual.
This is a test report from one of the customers.
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