How do i do a manual reset to my en genius EAP 300 Access point. ?

the problem with your AP , change it

Go back to v 1.2.4

You don't seem to understand what an Access Point is.

an AP is used to extend your wireless range and will connect to your router to provide network and internet access. An AP by itself cannot connect to the ISP since it does not use a WAN port

a router is an AP that will allow you to connect to your ISP for internet connection. A router can be configured to work as an AP but a AP cannot function as a router.

Read the manual. When you reset the AP the IP of the AP device became 192.168.1.1
That means you need to set the IP address of your computer to 192.168.1.x where x is anything from 253-2 and the subnet mask to 255.255.255.0

engenius 2500mW EIRP EAP300 802 1bgn wifi access point

engenius 2500mW EIRP EAP300 802 1bgn wifi access point

I thought the default IP was 192.168.0.1. That is where mine went when I pressed the reset button.

Hi, check out this link: https://support.apple.com/en-gu/HT202068

Hope it helped.

http://www.engeniustech.com/resources/EAP-3660-UsersManual-V1-1.pdf
Find Page 16

Some engenius wireless access points do not have a username password configured by default, so try it with the username and password fields both blank.
Sometimes, I have tried to reset the password on a wireless access point, and later figured out that I had failed to successfully reset the device. Make sure that the device is plugged in while you hold down the reset button. Hold down the reset button for 30 seconds instead of 5.

This is a massive and expensive network, which appears to require a full signal and configuration audit. It's quite possible that many of your problems are stemming from the APs you have already deployed being situated in suboptimal and conflicting locations, which is an issue with three-dimensional wireless networks.
I really don't see your problems being debugged by anyone short of an experienced on-site wireless network technician. I'm saying this as a person who tuns a one-man company serving two rural communities with wireless internet service.
Sorry.