From my searches and comments on other forums, I suspect there is no such thing as a manual. I think you're best posting details of your problem and hoping someone has a solution for you. Best of luck.
Hi welcome to both of you. pdsalford is correct in that many devices don't have manuals. Check the link in my signature for generic manuals for using the various versions of Android put together by Google. Otherwise asking specific questions is the way to go.