how to extract and decrypt WeChat EnMicromsg.db on Android phone

One of my friend came to me with an Android phone. She saild somehting wrong with the hardware of her friend's phone, and her friend are eager to backup his data,especially  WeChat chat messages..unfortunatelly her friend forgot the accoutn/password to logon WeChat....What can I say..she is one of my best firend..I should do her a favor...One of my friend came to me with an Android pho