Revert to Factory Firmware (tp link c6)

Installing and Using OpenWrt
1

my router model is tp link c6.
i have installed open wrt and now i want to revert on factory firmware again.
while flashing image, ask me to choose option about deletion the partition or not.
should i delete the partition ?

the image file is:
openwrt-22.03.3-ath79-generic-tplink_archer-c6-v2-us-squashfs-factory.bin
Archer c6us-up-ver1-1-8-P1[20210226-rel34930].bin

2

Try this wiki:

3

After revert to Factory firmware,
My router's 5 Ghz channel not transmitting signal.

4

(My guess: you need to configure the AP under OEM firmware.)