Recently i met this error when activate the V2018.7 mb sd c4, No Valid startkey detected
I contacted seller seven on the website www.chinacardiags.com and she is so kind to help me solve the problems.
firstly: make sure your computer time is current.
Secondly: you need to delete one file named: lic-key2.dat in c disk, how to find this file? here it is: C disk-programdata-LicDir and then delete this file: lic-key2.dat
At last: reopen the keygen to activate, so it is ok.