Comtrend Corporation NexusLink 3120 User Manual page 144

NOTE: This entry has the same effect as the Reset button. The NexusLink 3120
board hardware and the boot loader support the reset to default. If the
Reset button is continuously pressed for more than 10 seconds, the
current configuration data will be erased. If the Reset button is
continuously pressed for more than 60 seconds, the boot loader will erase
all configuration data saved in flash memory and enter bootloader mode.
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