Just purchased a BV6000 V01_20161011 Android 6.0.
Was told by seller would get upgrade to 7.0 OTA.
I have tried but I all ways get the message, system currently up to date.
When will I get an upgrade ?

If OTA don't work for you you can download the ROM ( viewtopic.php?f=144&t=101183#p284253 ) and update over local file update (Menu in OTA window) of flash over PC.