One customer gave the feedback that he failed to use Xhorse VVDI Key Tool Plus to generate a key for VW Polo 2016 MQB all key lost after online calculation and successful immo data saving.
Miss synchronization data file.
Actually, the prompts before generating the dealer key have answered why.
For MQB instrument immo system, it needs token cost and:
1)Add Key needs a working key
2)All Key Lost needs the synchronization data
Although he’d done online calculation (cost 1 token each time) to get immo data, he still lacked synchronization data.
Go contact a third party like your vehicle’s dealer or specific online servers etc. Pay them extra to get synchronization data but part of vehicles not supported.
Load synchronization data to generate a dealer key.
Then press “Decode key” to finish following procedures as prompts and it should work.
One can get the synchronization data only from a working key or a third party.
So always save the synchronization file when adding a spare key against unexpected needs.