@unspeaker @tiredhorizon
Yep, especially if you take all the info on OpenWRT's wiki into account: https://openwrt.org/toh/hootoo/ht-tm05
Looks like it's quite tricky to flash in case things go awry — that information might be outdated, but if I were you, I'd think twice when considering it.
Normal well-supported router and a power bank might be a more solid choice 👍