Default [Q] ADB Pull/Push from Android System Recovery

I'm trying to pull and push my build.prop file because I think I borked either the line endings and/or the access permissions on it.

However, I can only get to the Android System Recovery <3e> screen.
When I type "adb devices" nothing shows up. If I choose "apply update from ADB", I can see the device, but I guess I cannot push/pull while it's in that side load mode.

Any thoughts/suggestions on how to use ADB to fix that build.prop file?