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Hardware specification:
SoC: MediaTek MT7981B
Flash: ESMT F50L1G41LB 128MB
RAM: ESMT M15T2G16128A DDR3 256MB
Ethernet: 3x 1G
Button: Reset, WPS
MAC addresses
LAN: Label MAC (stored in Factory partition offset 0x1fef20)
WAN: LAN + 1
WiFi: LAN
Official LED layout, from left to right:
[power] [internet] [wps] [wifi] [lan3/2/1] [wan]
Redefinition for OpenWrt:
[power]: used for led-boot, led-failsafe, and led-running
[internet]: used for WAN RX/TX indication
[wps]: used for led-upgrade
[wifi] and [lan3/2/1]: unchanged
[wan]: used for WAN link indication
Installing OpenWrt:
- Setup a tftp server on your PC. Copy
xxx-preloader.bin, xxx-bl31-uboot.fip and
xxx-initramfs.itb to tftp root directory.
- Connect to the router via ssh or telnet,
username: useradmin, password is the web
login password of the router.
- Backup all critical flash partitions with
the following commands where x.x.x.x is
the IP of your PC.
IP=x.x.x.x
cd /dev
for d in /sys/class/mtd/mtd?; do
if [ "$(cat $d/name)" = "BL2" ]; then
tftp -l $(basename $d) -r bl2.img -p $IP
elif [ "$(cat $d/name)" = "FIP" ]; then
tftp -l $(basename $d) -r fip.bin -p $IP
elif [ "$(cat $d/name)" = "Factory" ]; then
tftp -l $(basename $d) -r factory.bin -p $IP
fi
done
for d in /sys/devices/virtual/ubi/ubi0/ubi0_*; do
[ "$(cat $d/name)" != "customer" ] && continue
tftp -l $(basename $d) -r customer -p $IP
break
done
- Flash with the following commands:
cd /tmp
tftp -r xxx-preloader.bin -g x.x.x.x
tftp -r xxx-bl31-uboot.fip -g x.x.x.x
mtd write xxx-preloader.bin spi0.0
mtd write xxx-bl31-uboot.fip FIP
mtd erase ubi
- Set a static ip(192.168.1.254) for your PC.
And then reboot the router. It will run
initramfs image automatically.
- After openwrt boots up, perform sysupgrade
via web UI.
Reverting to the vendor firmware:
- Setup a tftp server on your PC with ip
address 192.168.1.254. And make sure
bl2.img, fip.bin, factory.bin and customer
are located in tftp root directory.
- Power off the router.
- Press and hold WPS key, then power on
the router.
- Release WPS key, when internet/wifi/wps
leds are blinking.
- Wait until internet/wifi/wps leds light
up, power off the router.
- Press and hold reset key, power up the
router, release reset key 15s later.
- Connect to http://192.168.1.1, now you
can upload vendor .bin firmware.
Uboot netconsole:
Uboot netconsole can be enabled by WPS
or reset key.
- Setup a linux PC with ip 192.168.1.254.
Open a new terminal and execute
'stty -isig -echo cbreak; nc -lup 6666'
- Press and hold WPS(or reset) key, then
power on the router.
- Release key once internet/wifi/wps leds
are all on.
NOTE: don't hold the key more than 5s
after internet/wifi/wps leds on, or it
will try to revert to vendor firmware.
- 5s later, uboot bootmenu will show on
the terminal.
Signed-off-by: Zhiwei Cao <bfdeh@126.com>
Link: https://github.com/openwrt/openwrt/pull/18631
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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