sure, if you're fine with staying on openwrt 17 or 18.
there's no such thing, if you want it unbrickable, keep it switched off.
install the latest official openwrt available, then upgrade to the ath79 community build,
make sure to reset the settings in the process.
a how to has already been provided. at least for the 1st part.
First I will flash the system install image, which will be done by router upgrade image option. I am asking if I can upgrade to latest community build by the router web page itself not using putty
@frollic@Pilot6@psherman I have downloaded two image files from the link given above. One is factory one and the other is sysupgrade one. I have flashed factory one via web interface of official tp link web interface