I'm trying to help fix potential issues in the Wiki's documentation, so I tought that this place was the most appropriate for posting this.
wiki.openwrt.org/toh/tp-link/archer-c5-c7-wdr7500
IMHO for completeness, the Flash Layout section of the OpenWrt's documentation should have two sections: one for the 8MB flash chips and another for the 16MB flash chips. For my device (Archer C7 V2, 16MB flash chip):
0x000000000000-0x000000020000 "u-boot"
0x000000020000-0x000000120000 "kernel"
0x000000120000-0x000000fa0000 "rootfs"
0x000000fa0000-0x000000ff0000 "config"
0x000000ff0000-0x000001000000 "ART"
Documentation only shows layout for 8MB:
0x000000000000-0x000000020000 "u-boot"
0x000000020000-0x000000120000 "kernel"
0x000000120000-0x0000007e0000 "rootfs"
0x0000007e0000-0x0000007f0000 "config"
0x0000007f0000-0x000000800000 "ART"
Regards,
DjiPi