Just bought an AX88U and flashed with 384.9 but my 5Ghz radio was disabled after flashing. I had done a factory reset via the reset switch at the back to no avail. If I flashed with the official firmware from ASUS, I don't have this issue. I had also tried to enable the radio via the Advanced Setting under Professional tab but it doesn't help. Any ideas?
You can look at the temperatures section, it say 5Ghz disabled.

You can look at the temperatures section, it say 5Ghz disabled.

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