TP-Link Archer MR200 cant update

Installing and Using OpenWrt
1

Hey everybody

I got a used Archer MR200 (eu) V. 1, its a spain version from Amena sim unlocked. I tried to update, but it doesnt work. Over GUI it says 1.0.5 is the newest available, when I click Upgrade it crashes at rebooting, my 4G is gone and Im on the same version. (Hardware reset fixed it)
I tried some .bin over LAN and GUI, I get the message my hardware is not supported.
What can I do to install the latest, unbranded software version? Need to update the modem for DT Germany

2

Have you searched the forum already?
There are multiple postings about MR200. Please check if you find something useful.

3

I already looked the Forum, found some interesting in the archives too. I need to flash the firmware with tftp and cut the header as far as I know.
But I have no idea if its the right way, dont want to brick my device. Some sort of how to would be nice.

4

https://openwrt.org/toh/tp-link/archer-mr200