I failed to write Audi J518 ELV emulator 2010 ol01y with xhorse vvdi prog. It says chip not connected. Any idea?
You did wrong wiring connection.
Follow correct wiring diagram here and make good connection again.
Here is the detailed instruction on how to write Audi J518 emulator with vvdi prog
How to Write Audi J518 ELV Emulator 256, 128 with VVDI Prog?