Q: iOS 9.3.5 Problems

Hi

Follow the steps here:

• If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
• Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

Below is a User Tip about Wi-Fi issues. Suggest starting from the top and working down.

1) Restart you device. If a normal restart does not help try holding down the Home and Sleep buttons at the same time for about 15 seconds until the Apple logo appears.

2) Reset Network Settings:  Settings > General > Reset > Reset Network Settings. Rejoin the Network again.

3) Reboot Router/Modem:  Unplug from power for 2 minutes and plug again. Update Router Firmware (check manufacturer’s support website for a newer FW). Also try different bands (2.4 GHz and 5 GHz) and different bandwidths (20 MHz recommended for the 2.4 band). Channels 1, 6 or 11 are recommended for the 2.4 band.

4) Change to Google's DNS:  Settings > Wi-Fi > Click on the Network, Delete all numbers under DNS and enter 8.8.8.8 or alternatively 8.8.4.4

5) Disable device prioritization on the router if this feature is available. Also disable any VPN apps and test Wi-Fi again.

6) Determine if other Wi-Fi devices on network are working well (other iOS devices, Macs, PCs).

7) Try device at another Network, i.e., neighbors’, public coffee house, etc.

8) Backup and Restore the Device using iTunes. Try restoring as New first and testing it. If ok try restoring the backup (the backup could be corrupted).

https://support.apple.com/en-us/HT201252

9) Go to an Apple store for hardware evaluation. The Wi-Fi chip or the antenna could be defective.

User Tip:  https://discussions.apple.com/docs/DOC-9892

I have the exact same issues with wifi upon moving to 9.3.5.  I have tried all the typical fixes - hard reboot, resetting network settings, etc., and nothing worked. 

Apple's recommended settings for Wi-Fi routers and access points are detailed here:

• Recommended settings for Wi-Fi routers and access points - Apple Support

If the issue persists after following the advice provided in Apple's support articles (including those linked in my previous reply), I suggest that you contact Apple Support or make a Genius Bar reservation with a view to having your iPhone checked and, if recommended by Apple, serviced (whether under warranty or via chargeable repair service):

• Contact - Official Apple Support
• https://twitter.com/applesupport
• http://www.apple.com/retail/geniusbar/

To check your warranty status:

• https://checkcoverage.apple.com/

I've tried all of these steps.  We have several iPhones in the house and only mine is affec and it happened as soon as I upgraded.  Seems too much of a coninidence that it is a problem with my phone and not a bug of the upgrade but I will make a Genius Bar apt I guess. 

Hi,

i'm from Germany and i have the same problem, with my iPhone 6.

The wireless reception is at most 2 of 3 bars, mostly just 1 bar. The download speed is also extremely slow. None of the proposed solutions helps somewhat!

Me as well

Same thing on an iPhone 5S, iPhone 6+, iPad Air 2, AND iPad Pro 9.7

NOTHING WORKS

This is NOT a device problem. This is an APPLE problem!!!!! Been iPhone and iPad owners since iPhone 3g and iPad 1. NEVER has this happened to this degree!!!

Funnily enough - the security fixes of 9.3.5 appear to have an issue with using encryption on WiFi networks.

I have a 2.4Ghz and 5Ghz network on my TP-Link Archer D9.

2.4Ghz = 20Mhz bandwidth, WPA2-PSK/AES 802.11bgn mixed

5Ghz =  20Mhz bandwidth, WPA2-PSK/AES 802.11a/n/ac mixed

iPAD Air really struggled to connect - even though the password was OK - and also couldn't route to the Internet

iPhone 6S Plus is also not connecting to Wifi Network so I suspect the same.

This is the same for both networks (so not a signal/frequency thing)

I set up a 2.4GHz guest network with NO encryption and iPad connected to that with no problems whatsoever and great throughput.

I quickly configured my normal 2.4GHz network to WEP and the iPad was fine.  WPA2-PSK is the issue.  I've obviously re-enabled WPA2-PSK.

Of course, I don't recommend you move away from WPA2-PSK, but if a fix becomes available (iOS10?  9.3.6?) then you may want to briefly disable security (or change to WEP) to download the bug fix.

WEP is significantly less secure than WPA2-PSK.

update: it looks like WEP is OK on iPhone 6 Plus iOS 9.3.5 but not on iPad Air 9.3.5. 

iPad Air seems to have similar issues with WEP as it does with WPA2-PSK in that it connects after a while (only using 64 bit WEP - not 128 bit) but it still doesn't seem to be able to use any encryption.

I found something VERY interesting

My home security system not only connects through the phone/cellular, but also has it's own router for "automation" features that I don't even have and would never use. Yet it still needs to be hooked up to have "full" features according to the company.

Yesterday I had a wild idea, and DISCONNECTED said router.

Low and behold it seems the Wifi for my IOS 9.3.5 devices has been CLEARED by this. Something with this update seems to not like the extra router and it's settings - Atleast in my situations. I'd be curious to know if others who have WiFi problems have any kind of home automation/ home security like devices in their home.

I set a static IP address for my iPad (3rd gen) and my iPhone 6 and so far this has stopped the dropped wifi. As others have said, I would use my guest account without issue, but that isn't encrypted.

OK, scratch the success with the static IP address. That is working fine on the iPhone 6, but the iPad (3 gen) is now not working. I rebooted and the settings show that it is connected to my main wifi, but I don't get the wifi symbol in the upper left. Even when the wifi symbol was showing, it was very slow.

A few other points to note is that with iOS10 coming out tomorrow (13th September) I doubt that Apple will bring out a fix for iOS9.3.5 - but lets hope that they have had time to roll up the fix in to 10.0 or there could be chaos tomorrow!

And as I'd also been having challenges with broadband stability, I got Wifi Explorer (for MAC) from the App store (£14.99 though) and this helped identify where Radio channels were competing so I was able to narrow the bands to 20 MHz and move them to a more free area - which has improved Wifi stability massively. 

But this still has nothing to do with bug around use of encryption on WiFi networks which will need an iOS software fix for resolution.