Help! I am trying to uninstall OpenWrt but it won't work (Archer C2600)

I would like to uninstall OpenWRT, I am using the TP-Link Archer C2600 and after I installed it i figured out it wasn't for me whenever I use the flash firmware tool in the web interface it says "The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform.
" I am using the stock firmware (and I have read that I need to use special stuff if it has boot in it) please some one help me

I also can't figure out how to make it a trx file instead of a bin file

Why not take a look into the wiki?

does it have to be a trx file to flash a recovery or can it just be a bin file?

thank you!!!

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