google pixel 2 slot unbootable load error

If I turn the phone off and back on, it gives me ERROR: Slot Unbootable: Load Error. Now my bootloader comes up, but I have no recovery, and for some reason fastboot is not detected by my Windows PC or my Fedora Linux system. Open a command prompt/powershell window in the folder that you have the ZIP in. Use power button to enter ADB sideload mode. Use volume button to scroll down to 'Update using ADB sideload'. Let go of both the power and volume buttons. So I was screwing around and booting TWRP through fastboot earlier(fastboot boot twrp-etc.etc), and ran the zip to install it in a stupid way(adb sideload, which I wasn't thinking and should have just flashed in fastboot first). Press and hold power, then press volume up, then press volume down. (I have been searching forums, but I didn't find this link until after I posted, sorry admins) Pixel 2 'ERROR: Slot Unbootable: Load Error' after stock flash After a few years away from custom ROMs I wanted to dabble with my old Pixel 2, but when I tried to flash TWRP, while I was able to mount the image and push the zip, when I tried to install it, it seemed to hang on the initial step of 'running boot image patcher on slot a' and didn.

EDIT: Still open to suggestions, but am going to try the method posted Here and see if this works.

Google pixel 2 slot unbootable load error