you can watch this video how to recover bricked GPU
https://www.youtube.com/watch?v=pCfubRQz72E&t=850sUsually there are two ways... 1. if your card has dual bios you can switch to other bios to be able to boot, and than when you are in windows switch back and reflash with stock vbios
2. you use another gpu. and you connect monitor to it, once in windows you reflash "dead" gpu with stock bios...
And yes probably also third solution like FireBallex suggested would work...
You can enter your bios settings and set gpu as primary display and connect display to your motherboard instead either through MOBO hdmi or vga and try to flash back to Stock, it seems like you don't have enough experience about flashing bios, better watch some YouTube videos first