No Valid startkey detected-how to solve for MB SD C4C5

Recently i met this error when activate the V2018.7 MB SD C4, No Valid startkey detected

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I contacted seller seven on the website www.obd2tool.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

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At last:  reopen the keygen to activate, so it is ok.

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