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Comfast CF-E393AX is a dual-band Wi-Fi 6 POE ceiling mount access point.
Oem firmware is a custom openwrt 21.02 snapshot version.
We can gain access via ssh once we remove the root password.
Hardware specification:
SoC: MediaTek MT7981A 2x A53
Flash: 128 MB SPI-NAND
RAM: 256MB DDR3
Ethernet: 1x 10/100/1000 Mbps built-in PHY (WAN)
1x 10/100/1000/2500 Mbps MaxLinear GPY211C (LAN)
Switch: MediaTek MT7531AE
WiFi: MediaTek MT7976D
LEDS: 1x (Red, Blue and Green)
Button: Reset
UART: 3.3v, 115200n8
--------------------------
| Layout |
| ----------------- |
| 4 | VCC GND TX RX | <= |
| ----------------- |
--------------------------
Gain SSH access:
1. Login into web interface (http://apipaddress/computer/login.html),
and download the
configuration(http://apipaddress/computer/config.html).
2. Rename downloaded backup config - 'backup.file to backup.tar.gz',
Enter 'fakeroot' command then decompress the configuration:
tar -zxf backup.tar.gz
3. Edit 'etc/shadow', update (remove) root password:
With password =
'root:$1$xf7D0Hfg$5gkjmvgQe4qJbe1fi/VLy1:19362:0:99999:7:::'
'root:$1$xf7D0Hfg$5gkjmvgQe4qJbe1fi/VLy1:19362:0:99999:7:::'
to
Without password =
'root::0:99999:7:::'
'root::0:99999:7:::'
4. Repack 'etc' directory back to a new backup file:
tar -zcf backup-ssh.tar.gz etc/
5. Rename new config tar.gz file to 'backup-ssh.file'
Exit fakeroot - 'exit'
6. Upload new configuration via web interface, now you
can SSH with the following:
'ssh -vv -o HostKeyAlgorithms=+ssh-rsa \
-o PubkeyAcceptedAlgorithms=+ssh-rsa root@192.168.10.1'.
Backup the mtd partitions
- https://openwrt.org/docs/guide-user/installation/generic.backup
7. Copy openwrt factory firmware to the tmp folder to install via ssh:
'scp -o HostKeyAlgorithms=+ssh-rsa \
-o PubkeyAcceptedAlgorithms=+ssh-rsa \
*-mediatek-filogic-comfast_cf-e393ax-squashfs-factory.bin \
root@192.168.10.1:/tmp/'
'sysupgrade -n -F \
/tmp/*--mediatek-filogic-comfast_cf-e393ax-squashfs-factory.bin'
8. Once led has stopped flashing - Connect via ssh with the
default openwrt ip address - 'ssh root@192.168.1.1'
9. SSH copy the openwrt sysupgrade firmware and upgrade
as per the default instructions.
Signed-off-by: David Bentham <db260179@gmail.com>
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