Hello dear community,

my problem is that i can't connect (LAN) to the interface with any browser .
With SSH (Putty) it still works.

I try to reset to default settings with "firstboot" but it doesn't work.
("/dev/mtdblock3 is mounted as / overlay, only erasing files")

I still can't connect to the interface with a browser.

What can i try know - PLEASE HELP ME

It sounds like you installed a snapshot which doesn't come with a gui (only stable versions have gui), so ssh in and run -

opkg update
opkg install luci
Then you should have a gui.
              
Yes that may be possible.
Lede was the OS before Open-Wrt but instead to flash with "factory" (because it's new OS) i do it with "sysupgrade" because  foolishly in my mind it was an update  .....
Thx i'll try it now!
              
Now i  have a gui and can connect with a browser to the web interface but:
"No password set! There is no password set on this router. Please configure a root password to protect the web interface and enable SSH."

But i can't set a password when i click on "Go to password configuration".
Error message: "404 Not Found: Sorry, the object you requested was not found. Unable to dispatch: /cgi-bin/luci/admin/system/admin"
              
Puhh thanks I thought I did everything wrong.......
I had even made a backup of LEDE because of the settings but I can probably no longer use it or?
Even if not synonymous, that's done quickly.
But what went wrong if I did not make the mistake?
              
When i want to set a password in SSH:
"passwd: can't update password file /etc/passwd"
Command opkg list-installed | grep luci said:
liblucihttp
liblucihttp-lua
luci - git
luci-app-firewall
luci-base
luci-lib-ip
luci-lib-jsonc
luci-lib-nixic
luci-mod-admin-full
luci-proto-ipv6
luci-proto-ppp
luci-theme-bootstrap
              
Thx 4 your answer!
I have already downloaded the upgrade.
The problem still is that i can't login to the Web-Interface.
Or is there another way to install the sysupgrade?
              
How can i install the sysupgrade when i can't login to the Web-Interface?

Is there another way to install the sysupgrade like SSH (Putty)?
I'm sure the script blockers on my browser do not cause any problems and have nothing to do with it.
The file where you confirmed it was the right one?
How can i install this file without a functional webinterface.
Or how i can do it with SSH < step by step PLZ .... I'm not very good at handling commands......