Please how do i flash in or update my Oukitel u11 plus OS/firmware to the original or updated one

[Victorluther]

Someone mistakenly flashed in an outdated firmware into my new oukitel u11 plus..now I just hate the phone because it doesn't show to be Powered by android on start up anymore, neither is it even certified by Google play too anymore,etc

 

[Rukbat]

Start here. Then click the "Guide to Flash Stock ..." button on the bottom to get to here for instructions.