Originally Posted by forest1971
If you have an sd card it will be easier. Just load a working rom in it using computer. Otherwise, there seems to be a sideload option in twrp, but i have not tried.
Sideloading is simple
go to advanced settings and enable sideload.
connect phone to pc and open command prompt.
adb sideload "name of zip"
this should install the zip... may be the CM10.2 you downloaded was a bad zip. download again and match md5.