Recovery USB does not work

I reverted the firmware of the chromebook back to the default with a backup i had. However, now it says “ChromeOS is missing or damaged. Please remove all connected devices and start recovery” However, there are no devices connected. If i manually go to the recovery screen (esc + refresh + power) and plug in the USB, nothing happens.

Currently on Acer Chromebook 311 (C733)

that’s a generic message, just to remove anything that’s connected

then use a different USB stick, different port, etc