Here is a review of Key Tool Plus/ VVDI MB:
Mercedes ML W164, only key stopped worked. Suspicious for damaged EIS (not even start cluster), confirmed, some adapters replaced and solder jobs. Still not started – old key not synchronized with EIS. AKL bench job.
KTP did not even read EIS! Lot of trials…
Same connection, same cables and adapters used for VVDI MB TOOL, read EIS ok, read pass – but only slow technique, don’t to work with fast MB adapter (lDK why), million times in and out IR adapter, but after few hours read pass and programmed new key, started a vehicle without issue
Here are some tips for reading W164 EIS:
For Key Tool Plus Key Programming Tablet,
1)Try if the tool would read EIS data without Fast Adapter
2)Make sure the Fast Adapter is the one for Key Tool Plus (There is one port at each side of the adapter)
3)Try Solderless EIS W164 Adapter
If the tool is connected to VVDI MB Fast Adapter, select W164 (Fast) option and no need to in/ out IR adapter.
Done! Hope this helps!
Skype: xhorsevvdi.com
Whatsapp: https://wa.me/8613983756354
Whatsapp: 
Skype: