I was using the web installer to install graphene on my Pixel 7 pro and I got this error- Error: Failed to execute 'requestDevice' on 'USB': No device selected. Now the only thing I get on the screen is The bootloader is unlocked and software integrity can not be guaranteed. I didn't interrupt the the process. Did this just ruin my phone or how can I get past this?
Web install of Graphene didn't complete
No you didn't brick it. Could be a problem with the USB cable you're using or the USB port on the device you're using. You want to use the cable that came with your Pixel if possible. I don't feel qualified to help you with install issues but for friendly real-time support you could try the GrapheheOS Matrix forum. Lots of helpful folks in there to help you out.
Check the Contact section of grapheheos.org and go to #grapheneos:grapheneos.org