Passat b8 2015 can read with OBDSTAR X300M, but not write e say to use real key but car its keyless shown as below. Then followed with solution.
Solutions:
Take out the battery from key. After that, put the hey near start button and press start. Try to find the correct position. Its work…
Finally, it works.
Thanks to @mobel (DK forum)
Edit by Laurance from obdexpress.co.uk