Question about dashboards ?

hi ...
i have a Question about flashed xbox360
i bought assassin greed rouge ( copy ) but it want run
Does this happen becuse i have old dashboard or from lt+ version ?
how i know what lt+ v i have ? my dashboard ( 2.0.1.16537.0)
if iam updated my xbox will my xbox reading copy games ?
can i jtag my xbox with my self ?
regards