Hi zailon0,
I issued "show version" after the IAP has rebooted and this is the output:
a8:bd:27:ca:79:14# show version
Aruba Operating System Software.
ArubaOS (MODEL: 325), Version 6.5.1.0-4.3.1.0
Website: http://www.arubanetworks.com
(c) Copyright 2016 Hewlett Packard Enterprise Development LP.
Compiled on 2016-12-15 at 03:19:05 PST (build 57768) by p4build
FIPS Mode :disabled
AP uptime is 3 minutes 21 seconds
Reboot Time and Cause: AP rebooted Thu Jan 1 08:08:12 UTC 1970; Current uplink down, no useable uplink
Therefore, you cannot access the WebUI when there is no uplink connection because the IAP reboots. Then, there is no way to configure an IAP wherever you are if there is no a Ethernet connection.
On the other hand, I have done the second option, to configure a SSID and power on the IAP and check if it reboots, and indeed the IAP reboots anyway. Attached the output of this second option, you'll see the cause if the same.
Regards,
Julián