Recently I had the brilliant idea LEDE on MR3020 to update to 17:04:01 from 11/23/17 but I got the wrong file. (Lede-ar71xx-generic-tl-MR3020-v1-squashfs sysupgrade.bin)
Correct: (lede-ar71xx-generic-tl-mr3020-v1-squashfs-factory.bin)

Now I have no web interface anymore. Ssh goes with Putty. Not with browser.
Is this way right? generic.sysupgrade howto

The factory image is only when factory firmware is loaded on the router.  You did flash the correct one.

the normal builds do not include luci, you need to ssh to router and then

opkg update
opkg install luci

On a 4MB flash model there isn't space to add LuCI later.  So the most direct thing to do is install the 17.01.4 sysupgrade stable release build.  Release builds include the web interface.  The development builds do not.  Always use a sysupgrade bin file when already running OpenWrt or LEDE. The factory files are only used to flash out of TP-Link stock firmware.

If router is connected to the internet you can upgrade directly from the command line.

cd /tmp
wget http://downloads.lede-project.org/releases/17.01.4/targets/ar71xx/generic/lede-17.01.4-ar71xx-generic-tl-mr3020-v1-squashfs-sysupgrade.bin
sysupgrade lede-17.01.4-ar71xx-generic-tl-mr3020-v1-squashfs-sysupgrade.bin

Note that when you copy the URL from the LEDE download site, you must change it from https to http.  The wget included with a basic build cannot handle https.

(Last edited by mk24 on 26 Nov 2017, 15:28)

Now only: how do I connect ROOT @ LEDE 192.168.1.1 with Huaweimobilewifi 192.168.1.198 on the command line? Everything else I understood.

The setup for gaining Internet access through another network that offers you a standard AP-- a hotel or coffee shop, mobile phone in wifi hotspot mode, or a dedicated mobile hotspot device-- is called a routed client.  Search on that term.

You can reflash without Internet access on the router by downloading the firmware .bin on a PC then using scp to copy it to the router's /tmp directory.

(Last edited by mk24 on 26 Nov 2017, 16:23)