Throw me a life line...please

A little knowledge is dangerous. I have a tab 3 sm-t217s that I wanted to root and use a custom rom. I installed twrp recovery and flashed a cm rom but I really didn't care for it. I decided to flash a differentry rom and when I wiped, without thinking, I wiped everything. I can't boot to recovery but I can get into download mode. I assume I wiped everything so what can I do now?
Thanks

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