SSH to the device. You can get the IP addres from the controller screen. The default username/password is ubnt/ubnt.
upgrade https://dl.ui.com/unifi/firmware/U7PG2/4.3.21.11325/BZ.qca956x.v4.3.21.11325.200922.1139.bin
You can get the latest firmware from https://www.ui.com/download/
– For Zero Handoff Roaming, you’ll need to install the UniFi controller version after v3.1.x
– Next setup a new WLAN Group by navigating Settings > Wireless Networks
– Next add a new WLAN Group by click the ì+î. Now give a name and Enabled Zero-handoff to make your roaming WLAN Group.
– Finally just add the access points you want to participate in this roaming group to this WLAN Group and it should then work fine.
– After initial setup, the UAPs handles Zero Handoff Roaming, so it works independently of the UniFi Controller software.
Readers will learn how to run the Ubiquiti UniFi controller software as a Windows service.
Windows services are often useful since they are “background” applications which don’t require any attention on the part of the end-user. In this way, the service will launch upon startup, without any intervention on the part of the user.
https://help.ubnt.com/hc/en-us/articles/205144550-UniFi-Run-the-controller-as-a-Windows-service
Or
1. Close any instances of the UniFi software on the computer. If the UniFi Network Controller was just installed, make sure to open the controller software manually at least once, or let it run at the end of the wizard. Once you see the message UniFi Controller (a.b.c) started, the controller may be closed.
2. Launch the Command Prompt as an Administrator. On Windows 10 this would entail right-clicking and selecting “Run as administrator”. Please see Windows documentation to identify the appropriate method for your specific Windows version.
3. Change directory to the location of UniFi in the computer using the following command (exactly as it is here, no need to substitute anything):
cd "%UserProfile%\Ubiquiti UniFi\"
4. Once in the root of the UniFi folder, issue the following command to install the UniFi Network Controller service:
java -jar lib\ace.jar installsvc
5. Once you’re at a new command prompt line, after it says “Complete Installation…”, issue the following:
java -jar lib\ace.jar startsvc
6. Close the command prompt window either by entering the exit command, or clicking the X.
7. To access the UniFi Network Controller now open a browser and go to https://localhost:8443. Alternatively, the desired interface IP, or FQDN that is mapped to that host (in place of “localhost”) may be used.
To reset the UniFi APs, power them on, and allow them to fully boot. (In case powered by the POE adapter, make sure the cable on the LAN port of the adaptor is unplugged.)
After they’ve booted, press and hold the small reset button (located on the back of the device) for 25+ seconds.
Wait for stable Amber/White LED.(Now replug the cable into the LAN port of the adaptor)
This should reset the UniFi APs and put them back into a discoverable state again.
UniFi has always supported roaming according to base 802.11 standards. However with Zero-Handoff Roaming enabled, clients can freely roam between UAPs without incurring any latency penalty as a result of the roam. The basic premise is Zero-Handoff enabled UAPs appear as a single AP from the perspective of the client, thus eliminating disconnection.
Zero-Handoff Roaming is available starting with v3.x.
https://help.ubnt.com/hc/en-us/articles/205144590-UniFi-What-is-Zero-Handoff-
