There is a rumor that VXDIAG Porsche PIWIS Tester III (PT3G) will not work on old models nor DoIP protocol.
VXDIAG PIWIS3= Porsche tester ii + PT3G software (2017 up and DoIP models)
It is the only VXDIAG VCI supports Porsche (latest 2018 version) especially the latest models based on Ethereum:
For Panamera (971) 2018
For Cayenne (92A) 2018
For Macan (95B) 2018
For 911 (991) 2018
Tester III perfectly compatible with Tester II:
PT3G Supports Porsche both old and new from year 2005 to 2018.
For Porsche 911(997) (991)
For Boxster/for Cayman (987)
For Cayenne up to MY 2010
For Cayenne from MY 2011