Can't Install Openwrt Linksys EA6500v2

Good afternoon I am trying to install openwrt-21.02.0-rc3 EA6500v2 and the factory program does not allow me to install it, any solution ???

Does a 19.07 image work? I'm not sure if the wireless is fully supported btw, it being Broadcom. I am unable to find any flashing instructions, all I find in the git log is a single commit adding a DTS for your router...

The same error does not work anyway, has someone had this problem with this router?