An error has occured while updating the device software

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AC Question

Hello, I am new here so hopefully this is the correct way to go about asking for help.

I rooted my S7 Edge (G935A) which went fine, but when I went to add TWRP I was unable to access recovery. Each time I would try to access recovery it would say something like "system software not authorized by ATT has been found on your phone." So I decided to revert back to stock using Odin and the firmware from Sammobile, it however failed and now I'm stuck on the "an error has occured while updating the device software."

- I can get into download mode
- I can NOT get into recovery and havent been able to since I rooted
- I've tried flashing with Kies however it just keeps asking me to enter a model number
- I've tried flashing with Smart Switch but after I enter the model number and serial number the app closes and nothing happens
- Odin fails everytime

Please help?