Shenzhen Sinoy Electron Technology Co., Ltd
They’ll cheat you and after that they will denied there S/N product and will call you a liar.
Oh my God, you are a live. being hiding for long time. More then a month
Where did you learn cheating like this? Aren’t you a shame?
Facts!
Your engineer first checked on line the VCM S/N (I saw it, On line, first he checked the S/N product and VCM Version)
Only after he had confirmed it your S/N product, he tried for 3 hours to find the problem.
If it's not your S/N why he tried so much for 3 hours?
If it’s not your product, then why you asked me to send it back?
Why you sent a new other VCM instead? (Again the new VCM had the same problem “No communication with VCM“ the same problem your engineer had)
Old VCM you said?, Not your VCM? But the S/N is correct?
Well my friend let us have the clients judge who is telling the truth hear.
Why you need to use ugly words?, shame on you.