there is no os installed

[kerellos mofeed]

i removed the system
i tried to flash a new room
but TWRP can not read the external sd card
what to do

 

[rootinchase]

If you have a computer you can use, use adb to side load the ROM.

 

[Youdoofus]

you could also use Odin to flash an OS, but that would mean that youll have to re-root. Not at all difficult to do.