no os installed !!! - lenovo sisley s90-u

ok im a newbie who messed up with my sisley ,
stuck at boot ,
now i only have the twrp . thats all !!! .
cant flash any rom on twrp at all ,
always go to error .

if im going to reboot system , recovery or bootloader & power off ,
alway go reminded , "No OS installed !"
anyone can help ?

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