ASUS RT-AC51U settings lost after reboot

I just started using OpenWrt and know almost nothing about anything OpenWrt related. My goal is to use my VPN with my router but thats a different story.
What I did until now: I enabled Wifi and set up security for it and set up a root password, (that is literally all I did).
My Problem: After every Reboot all my settings are lost and I get asked to set up a root password again.
My Hardware: ASUS RT-AC51U (RT-AC750)
The release I use: 21.02.3
I would appreciate if you could help me and if so, explain like I am five since I know literally nothing about this. I saw the post of someone with the same issue but was confused since I don´t know where to put commands.

Which image exactly have you flashed?

Which posting exactly are you referring to?

If you mean what it says after "Firmware Version" it is: OpenWrt 21.02.3 r16554-1d4dea6d4f / LuCI openwrt-21.02 branch git-22.083.69138-0a0ce2a

This one: Lost luci settings

I think what he means is: did you flash a dedicated image for your device or one that happens to work more or less since it shares most/all hardware with another device that is supported in OpenWrt?

Also, a logread printout (text, no screenshot please) might be helpful to see what's going on, along with df -h output (again in text format).

I used the Supported Version which was mentioned on the device page, if that answers your question:

Do you mean system log or kernal log and where do I find "df -h"?

Both are commands you run in a terminal.

Sorry for the beginner question, but how do I reach the command line in luci?

You should use PuTTY.

After first logon with 'root' user change password with command passwd, and wait 10 minutes. After you can reboot your router.

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It is command in command line, use PuTTY as above.

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See if this helps:

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What i got out of logread had too many characters to be posted here. Can you maybe tell me what excerpt to look for so that I can post within character limitations?

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                    28.7M     11.1M     17.6M  39% /
tmpfs                    28.7M    244.0K     28.4M   1% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev

Hope this is right, thanks in advance!

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Thanks. You have no /overlay, so nothing to write your settings to. tmpfs is a RAM based file system.

As for logread, you can use a pastebin like e.g. and link to it here.


So an /overlay should do the trick? How exactly can I fix this?

I just uploaded it to my gdrive:

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It is very strange, it looks like initram image, which is loaded into RAM without using local storage. What method have you used for running OpenWRT?

I used the "ASUS Firmware Restoration Tool" Method, you can find here:

Re-download the sysupgrade image from the firmware selector and do a firmware upgrade from within luci


Well I didn´t knew that a sysupgrade would be mandatory :slight_smile: Thank you very much to everyone trying to help! The sysupgrade did the trick for me

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