CRITICAL NOOB MISTAKE!!! help maybe? please

[glitchgod]

so i rooted my devices and all was well and greate but i got extra greedy and wanted a omnirom

[ROM][4.4] Official OmniROM Nightlies for N8… | Galaxy Note 10.1 | XDA Forum

okay downloaded the rom.zip
moved to tablet
downloaded all the gapps.zip
but i did something wrong some how the rom failed to install and i cant boot to anything twrp.

i also cant install from sd card cause it wont let me pick sd card.

adb sideload is acting up and fails at stock roms

HELP PLEASE!

 

[Golfdriver97]

Did you make a Nandroid that you can restore back to? If not, you may have to consider flashing a stock ROM with Odin.