Odd iPhone 16 behavior after Orbi 772 FW update

HI Giovanni_L​ , good questions.

If IPv6 is disabled on the Orbi, that's fine - I don't know about Androids, but on iPhones there is no way to disable IPv6. But they obviously won't use it if the router has it disabled.

No, I do not meant reserve an IP address on the router for "manual IP address/DNS address". You see, the problem area imho is related to the DHCP communication between router and device - DHCP is what processes and hands the device an IP and DNS address in the pool of addresses the router is set up to use. By setting a manual address, you are eliminating any DHCP handshaking between router and device - hence eliminating the area with a bug/problem so your device stays connected. All "reserve an IP address" does is make sure the DHCP server in the router gives your device the same IP address every time it needs one - but still using DHCP, which we want to avoid.

First, check your address pool on the router. It should be the same page as on my 970 router. See if you have a "LAN Setup" page, maybe on the advanced tab. There, you'll see "Use Router as DHCP Server" checked - that's what sets up the router. Below it you have Starting and ending IP Address settings - it's probably set to 192.168.1.2 to 192.168.1.254. That's the entire addressable range on the network, so you should change the ending IP address to 192.168.1.150 - that should leave plenty of (148) addresses for devices in your house, plus room to add manual IP addresses above .148  By doing this, we avoid an address conflict on your network, where your manual IP address is also being used by another device because the address is inside the DHCP pool, and the DHCP server gave it out - duplicated IP addresses are to be avoided!

Once that is done, on an iPhone, go to Settings, then where you see Wi-Fi and the SSID name of your network to the right, tap that line. There, you will again see your SSID name with a check mark to the left of it (assuming you are connected on your WIFi) - to the right an 'i' in a circle. Tap that. Scroll down, and you will see 2 sections - IPV4 ADDRESSS and further down DNS. They both show Configure IP/DNS - Automatic. Tap those lines, one at a time. For IP address, tap the Manual line. Below, enter this:

IP address -   192.168.1.155  (or anything higher than 150 and less than 254 for the last number)

Subnet Mask - 255.255.255.0

Router - 192.168.1.1

Tap Save.

for the DNS section: Tap Manual, tap Add server, and just use your router - again I am assuming it's 192.168.1.1, that you did not change it. Tap Save.

Be sure to do both IPV4 and DNS - at least on Apple devices, if you don't do both you won't have any internet.

Test that the device has internet - bring up a web page, run a speed test, etc.

If you ever want to go back, go into that same section, tap Automatic, tap save. 

If you have any questions, post them here!

Oh and your other question - you can go back to a prior firmware version - you need to do it manually with the firmware files, they are probably on the Netgear support site. Maybe they this first, as its simpler and if it works you get all the other benefits of the upgraded firmware plus avoiding the problem hindering you?