tablet not entering recovery or download mode

my samsung tablet went through a tough time because it had no os and wasnt installing one so i went to odin and downloaded the stock rom then flashed it by odin while my tab was connected in download mode. suddenly the connection got unplugged while installing the new rom leaving me with a black screen. the real issue here is that i cant save my tab because it doesnt get to recovery nor download mode so im basically left with a useless piece of junk. i think there is a way to get it back because my computer recognizes it but odin doesnt. if i could get it to boot into download mode, i can get it back. but i dont know how...
my tab is samsung galaxt tab 3 lite sm t111.
pls help urgent!!!