Is OpenWRT supports this 2.0 model of router?
From checking https://openwrt.org/toh/start?dataflt[Model*~]=c1200 I don't see something exactly called a "C1200". It looks like an older model. Is there more information on the sticker on the bottom?
It's strange, 'cause in the bottom under C-1200 is also AC-1200 Wireless Dual Band Gigabit Router sentence.
Is there a "Model:" line on the sticker, sort of line the one in this photo of the bottom of an Archer C7v2?
"Model: Archer C7(US) Ver: 4.0"
(Sorry, it didn't place in line)
Archer C1200 is actually AC1200, as per their Datasheet.
If so, then https://openwrt.org/toh/tp-link/archer-c5-c7-wdr7500 is probably where to start.
Better double check it @anon18252423 to be on the safe side.
If it's a true C1200 then it's half supported only and it will probably stay that way forever.
Because it uses Broadcom chipsets, WiFi doesn't work as no binary/firmware.
AC1200 is another nomenclature, not model name.