TL-WR840N V5 Cant save OpenWrt Setting

hi guys

me again

the router WR840N V5 cant save setting or every download ...

after rebooting the system, every config is gone...


can you use putty/ssh to get results of these commands from router

head -n 5 /etc/board.json

Also have a look at this

1 Like

I think the v5 is MediaTek MT7628 with 8/64 memory. I don't find a device wiki page though. Exactly what firmware is installed? If it was an initramfs, or some other trick to get off of stock firmware, those do not save settings. You have to upgrade to the sysupgrade bin as the final step in installation.

1 Like
root@OpenWrt:~# head -n 5 /etc/board.json
        "model": {
                "id": "tl-wr840n-v5",
                "name": "TP-Link TL-WR840N v5"
root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root                 2048      2048         0 100% /rom
tmpfs                    29812        64     29748   0% /tmp
/dev/mtdblock4             320       236        84  74% /overlay
overlayfs:/overlay         320       236        84  74% /
tmpfs                      512         0       512   0% /dev
root@OpenWrt:~# free
              total        used        free      shared  buff/cache   available
Mem:          59628       11920       41256          64        6452       32764
Swap:             0           0           0

i dont know why doing this ...

i do last sysupgrade but nothing ...

after update last version snapshot , now i lost admin page !!!

but still have putty

Actually there is only 4 MB of flash, and it is full. (You need three 64k blocks (192 k) available on /overlay for writing to work).

As @mbo2o said, this device is not a good candidate to run OpenWrt. Typically a 4 MB device requires making custom images.

1 Like

so you say , i cant use openwrt on this device , right ?

Right. The flash chip is too small.

1 Like

ok how can i get it back to factory frimware ?

i lost my admin page !

The web server is not included in a snapshot build.

TFTP recovery should work to return to factory. TFTP will not care what firmware is installed, it doesn't even boot it. The best write-ups on TFTP recovery are on the TP-Link forum, since you're working entirely with TP-Link stuff.

1 Like

last qouestion

is ther any other custom rom can i install on this device ?

I doubt it. Since you just bought it, your best bet is to flash back to factory and return it to the store to trade for a better model.


i think its braked !

can you link me a tftp tutuorial ?

you only have 84k left.

Snapshot which you just installed and doesn't have Luci might be your only choice.

1 Like

So you cannot SSH?
(You were told Snapshot firmware doesn't have a web GUI.)

Be advised, you have to follow the instructions exactly. Do not alter, change, add or make typos!

yes bricked !!

i use tftp last version on tplink site

after flashing the green light is blinking ...

I think the "gear" light is supposed to blink all the time with TP-Link firmware. It is on steady with OpenWrt.

Shut down the TFTP server.
Reset your PC to "obtain IP address automatically" (DHCP).
Unplug the cable to the PC, wait 30 seconds and plug in again (to one of the LAN ports).
Try web browser to

ok now i can work with tftp
but i dont have factory rom ! mean flash it but wont work !
iam now in openwrt again !

Can you paste what you saw on the PuTTY screen???