Archer mr200 install firmware

i want to install openwrt on my modem.
my modem is tp-link archer mr200 v1.
there is a page for that but there is no install openwrt link or file to download it.
it has only the upgrade link.
what should i do?
please help me


This method is the only known method for replacing stock firmware. The suitable OpenWrt firmware for this is the sysupgrade one.

could you please help me how i can do this?

I could copy and paste the instructions from the link I posted, but I am sure you don't need that and you can read it directly from the link above.

sorry but i don't underestand that.
cuz i'm not an expert.
Could you please say it a little bit simpler that i can do it.
i need l2tp on my router