after a power outage the default Linksys firmware came back online and not OpenWrt. Even after a restart the router boots the Linksys frimware. Should I just reinstall OpenWrt and restore my config from backup? And is this likely to happen again after a powercut?
I am using the Linksys WRT 1900ACS router.
wrt1900acs is a dual partition boot device.
Perhaps you suffered 3 outages in very quick succession, resulting in router switching to booting from other working partition (which contains Linksys OEM firmware).
Have you tried booting from other partition containing OpenWrt?