Here is the instruction to read VAG MQB 35XX locked immo data and program key with xhorse vvdi key tool plus. It is similar to vvdi2+ vvdi prog (check procedure). But vvdi key tool plus will read immo data and decode by itself.
Go to Immo programming->VW->Select by type-> Instrument-MQB48 (VDO/JCI-NEC35xx locked)-> Start programming
Then select Read Immo data->Use the programmer to read data directly
Check wiring diagram in tablet or check wiring here
Here we use lift pin method.
Then read immo data and save.
NOTE: The saved immo data is still encrypted. So if you go to Generate Dealer Key-Load immo data, then upload this immo data, xhorse key tool plus will give error “The file is not supported by current model”
Go to Read Immo data->Load the read programmer file
Select and upload immo data read above
Calculating/decrypting immo data in progress
Read immo data successfully. Save immo data. Now you can generate dealer key and learn key with the immo data.
Select Generate dealer key-Load immo data
Upload immo data (the decrypted long file)
Check key information and press OK to continue generate dealer key, then learn key.