how to change android tv box frimware with universal one

[Android Central Question]

i buy android TV box DVB S2 call (Andredo 2560 ) from unknown company (seevii) which withdraw from the market and no longer support how i replace that company android system (firmware) with another universal one without any of it,s function stopping work my device properties amlogic s805 ddr3 1gb firmware dvb s2
thanks in advance
yasser