An error has occurred while updating the device software...

Alright so a while ago my phone got stuck in a bootloop, and I finally decided to fix it yesterday. However, I was an idiot and accidentally disconnected the cable while flashing on a new OS, and now my screen just says “An error has occurred while updating the device software. Use the Emergency Recovery function in the Smart Switch PC software” whenever I try to flash anything on. I tried smart switch, but it’s an s6 and it’s unsupported now. I tried kies and it just kept “Connecting” for over an hour so I’ve dropped that one too.

TL;DR, what program will let me restore my galaxy s6? Or what version of smart switch has the s6 supported.

Thanks