Thank you for your feedback.
The new Mifi has been discussed by devs on this website as early as June 2018, more than a year ago, then December 2018
I would like to purchase a battery powered wifi hotspot ideally with 5ghz and built-in 4g LTE, with openwrt.
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Can you share with us a timeline for the release?
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Some will be willing to enter a “hobbyist” program, like you did with AR300MD, in case there are issues to iron out