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There is a way to downgrade the firmware but I still couldn't find the previous firmware. Meanwhile, i put them in the store room and waiting for official firmware upgrade.

I am having the same issue. I got them last week. They were working fine during the setup. Same as you, I used the upgrade assistant to upgrade the firmwares to the latest - 1.4.21. No more 5ghz broadcast after that. I still can see 5ghz on wifi analyzer with 1% of signal strength sometimes. I...