- Format a USB flash drive as FAT32 (32GB or smaller is probably best)
- Extract the ROM file from this ZIP file to the USB flash drive: https://source.puri.sm/firmware/releases/-/raw/1939e3992629c184bba6edffafa3b3df0930969a/librem_14/pureboot-librem_14-Release-29.zip?inline=false
- Reboot, press a key to interrupt the boot process
- Select the flash firmware option from the HEADS GUI menu (make sure you select the option to retain your settings)
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