Download the latest Firmware below, there are two options. - Update: Keep all controller profiles as is. - Fresh Install: Wipes all profiles and restores the factory default profiles.
Connect your Glyph to a computer while holding the illuminated Menu button.
The Glyph will enter programming mode, and appear as a USB drive named RPI-RP2.
Drag and drop the downloaded .uf2 firmware file onto the RPI-RP2 drive.
The USB drive will disconnect, closing the window and the Glyph will connect to the computer as a controller.