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Q: How to factory reset AHM27292U?

for Windows users:

Please follow the document here: How_to_reset_the_AHM27292U.pdf

for Linux users:

The AHM27292U will present a serial console after boot, the dmesg content is like:

[1765924.387269] cdc_acm 3-1:1.2: ttyACM0: USB ACM device

Access the serial console with a terminal emulator in baudrate 115200, ex:

sudo picocom -b 115200 /dev/ttyACM0

And issue the command: firstboot && reboot now and confirm y in the console:

root@HaLow_STA:/# firstboot && reboot now
This will erase all settings and remove any installed packages. Are you sure? [N/y]
/dev/mtdblock6 is mounted as /overlay, only erasing files

Wait around 3~5 min till the reset process finish.