Can you share firmware upgrading history on
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check this issue more detail.
Please help!! I've the same problem.
device - usg60w, auto upgrade - disabled
Can you upgrade USG firmware to 4.33WK19 first.
And try to enter this command to flush memory.
Router> debug system _disk-cleanup
After cleared memory, and try to download AP firmware again.
How I can download AP firmware manually?
You can go to Configuration > Wireless > AP Management > Firmware. Click Check button.
It will check the latest AP version on server.
And then click Apply button.
If device is controlling AP, then device will download AP firmware to system first and apply to your AP.