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7 Things to Know About the iPhone 4s iOS 9.3.6 Update



The iPhone 4s didn’t get iOS 10 or iOS 11 and it won’t get iOS 12 or iOS 13. That means iOS 9.3.6 will more than likely serve as the final update for the aging former flagship. With that in mind, we want to take a look at the most important things to know about the iPhone 4s iOS 9.3.6 update.

If you’re still holding onto the iPhone 4s it might be time to upgrade. The device is stuck on Apple’s aging iOS 9 software which means you don’t get the features from iOS 10, iOS 11, iOS 12, and iOS 13.

It also means you’re missing out on security updates and bug fixes for lingering iOS problems. If you run into a problem on your iPhone 4s, you’re on your own. The iPhone 4s is, and will continue to be, stuck on Apple’s iOS 9.3.6 update.

The iOS 9.3.6 update’s release came as a bit of a surprise given that the iPhone 4s’ last software upgrade came several years ago. The update isn’t substantial, but it’s an important release for anyone still hanging onto the iPhone 4s.

If you’re just now getting around to updating your iPhone 4s and you’re jumping up from iOS 9.3.5, your iOS 9.3.6 upgrade is extremely tiny.

If you’re coming from something older than iOS 9.3.5, your iPhone 4s iOS 9.3.6 update will be a bit larger. The features and fixes from the iOS updates you skipped are baked into your phone’s version of iOS 9.3.6.

With that in mind, we want to rundown the key things iPhone 4s users need to know about the iOS 9.3.6 update’s performance, problems, the downgrade, and more.

iPhone 4s iOS 9.3.6 Reviews

iPhone 4s iOS 9.3.6 Reviews

We haven't spent enough time to provide quality feedback about the iPhone 4s iOS 9.3.6 update so we must turn to the opinion of others.

As we push away from Apple's iOS 9.3.6 release date we've seen iPhone 4s users from all over the world relay feedback about the update's performance.

If you haven't installed yet you should make it a point to dig into these mini iOS 9.3.6 reviews.


iPhone 4s iOS 9.3.6 update reviews are currently mixed. While some users are seeing solid performance in key areas like battery life and connectivity, others are complaining about lag, freezes, and occasional stuttering. 

Some users have said that they're sticking with the previous version of iOS 9, others have remained on iOS 8, while some others are saying iOS 9.3.6 solved some of the lag issues they've been dealing with. It's a mixed bag. 

As of right now there is no clear cut answer which means those of you with an iPhone 4s need to be extremely careful with this upgrade.

Dig into this feedback and decide if it's worth it to you and your device. For most of you, it will be thanks to the nature of the bug fix on board. 



  1. Enajrowe

    04/20/2016 at 8:18 am

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    Tʜɪs ɪs ᴡʜᴀᴛ I ᴅᴏ ….. See More

  2. enrico liverani

    05/25/2016 at 2:54 pm

    sorry but you guys need to get your collective head out of apples ass and start reporting the truth in the last 9 months the once fairly reliable apple is now become totally unpredictable. update after update has delivered crap after crap. in recent months i have lost my notes which caused huge personal issues (yes i should never have trusted software) apps just disappear from my phone. apps move around unexpectedly. the phone comes on without reason and i only notice because it has become hot in my pocket and yes i have taken care to turn it off before sticking it in my pocket.
    the latest crap is the current update which has from now where brought back 2500 emails into my inbox which i had previously deleted. people have put up worth apples incompatibility with the rest of the universe grudgingly because it made up for it with reliable products that is fast disappearing under the current leadership who just seem to bash stuff out. a friend could not match up an iPad with their iPhone in the same room this is just becoming unacceptable. in todays world you can go from hero to zero in a flash apple beware.

  3. Hector

    06/07/2016 at 10:05 pm

    Apple misses Steve Jobs! Since he is gone, Apple is not the same

  4. Bill

    07/24/2016 at 3:46 am

    Could someone please tell me if an iPhone 4 battery will fit an iPhone 4s. Thanks Bill

  5. jacquelinecollins786

    07/28/2016 at 10:45 pm

    when i looked at the figure of 8756 d .Than I have no other choice but to accept , what i ssaw .wr. They have been doing this for a year and get ride of their debts.. Yesterday they purchased new Aston Martin ………..23s
    Go To Web==========> >

  6. Nazwan

    07/29/2016 at 8:07 am

    Why update very slow because i done download and install

  7. Joel

    07/29/2016 at 3:00 pm

    This Upgrade has prevented my mobile from turning on!!! It’s faulty. Apple logo comes on then phone goes off. I attempted the upgrade this morning.

  8. Corey

    07/30/2016 at 1:16 pm

    My phone will not charge now.

  9. Edward

    08/01/2016 at 8:06 pm

    Just update to ios 9.3.3 and not a problem on my iPhone 4s works well and fast for me just hopes it stays that way

    • Saeed

      09/18/2019 at 6:40 am

      Hloo bro can u provide me an update link for 9. BCD I didn’t get any update so plz provide me

  10. Linda Menkhorst

    08/08/2016 at 8:12 pm

    My son just updated to ios 9.3.4, now 3G seems bricked.

  11. Juan

    09/02/2016 at 10:04 pm

    I upgrade my iPhone 4S to iOS 9.3.4 and the ear speaker crash. Since first moment the speaker play no sound. I turn back my phone to iOS 9.3.2 and everything is ok. I don’t want to risk my phone for an upgrade (9.3.5) that could be the last one.

    • Petya

      09/05/2016 at 5:00 am

      Hi Juan! How can I return my Iphone 4S from 9.3.4 to 9.3.3 ( Which version is better 9.3.3 or 9.3.2) ? Recently installed version 9.3.4 and the phone began to overheat and the battery is depleted… Need a help! Thanks

  12. johnny

    09/03/2016 at 5:52 am

    Iphone 4s with 9.3.5 is perfect what are you all on? Still an amazing phone and still updating and supported. Get a new phone or accept things on a 5 year old phone takes time.

  13. Robert Jackson

    09/05/2016 at 10:04 am

    I had my iPhone 4s since the beginning. And yes with 9.3.5 she is still kicking strong and doing well. I cannot say much for others, but if they have any problems with any updates. Just re-set the whole thing (make sure you on iCloud ) like a brand new phone, or to the last day like two days ago. And when all is boosted. You’ll have more storage for some reason , and everything you had since. And I have a 16 gigger (n####r) joke…. Smile….it won’t broke yo face! Jamaican Man. Make sure you have an iPad or MacBook. They all feed off one another like clockwork. Adios Gringgos

  14. premn

    09/19/2016 at 7:16 am

    Anyone know if there is a further update coming. My 4S has become almost useless. And I’m pretty sure it was after the 9.3.5 update. I’m hoping they might fix it? Thanks.

    • prem

      09/30/2016 at 11:38 pm

      Update: After one month of sound and other issues, my 4s suddenly started working fine with 9.3.5. Amost as if it needed a month to get used to the update. Thought I should share this here.

  15. Chris

    09/30/2016 at 5:20 pm

    4s stopped working when I tried to update to 9.3.5. Never was able to upgrade, only shows the “plug into iTunes” and is basically bricked until I figure out how to fix it.

    • Abramski

      10/13/2016 at 2:20 pm

      Can u put the device in DFU mode? You do it this way, make sure the phone is off AND connected to your mac or pc and leave iTunes open, press and hold down the power button and count 3 seconds, after you count those 3 seconds, you push down the home button but don’t release the power button, hold the power button and home button pressed simultaneously for about 10 seconds, in mean time the screen should turn black as you reach 6 or 7, after 10 second, release the power button but keep holding down the home button until you see a prompt in iTunes that will tell you to restore you’re iPhone. Good luck!

  16. Mike Morley

    11/01/2016 at 5:59 am

    Since updating to ios 9.3.5 my iPhone 4s shuts down at 35% battery level. I have heard that Apple do not plan to release any further updates to iphone 4s so I either put up with this or upgrade the phone. Of course apple would love me to upgrade the phone. I also upgraded my ipad2 to ios 9.3.5 and found it would then not let me past password sign in, it to a great deal of time to sort this out including complete reset and restore of the machine. I don’t have time to fix apples mistakes so I’m switching to android, at least you are not badgered continuously to upgrade it’s operating system APPLE NEVER AGAIN !

  17. Satheesh

    12/17/2016 at 10:05 pm

    When i update to 9.3.5 My 4s asking to connect itunes. I dont know why? Anyone can explain?

  18. NIROSH

    02/08/2017 at 4:39 pm

    what’s the Next date of 4s update

  19. Sue

    03/17/2017 at 6:23 pm

    9.3.5 was the last update for 4S!

  20. user

    03/19/2017 at 5:22 pm

    battery problem and overheating..

  21. Just Curious

    06/23/2017 at 11:29 am

    If this article was posted on Posted on 06/16/2017, then why are there comments from 2016?

  22. Navaid Ehsan

    08/04/2019 at 7:01 am

    I am trying to update to 9.3.6 but my iphone 4s is stuck at “downloading and installing”. Can someone tell me what is the size of the update because my iphone 4s reported it was 18MB but the time it is taking is too much. Please help

    • Roberto

      08/07/2019 at 5:31 am

      Same problem: iPhone 4s is stuck at installing 9.3.6.
      Did someone solved this issue ?

    • Gugun

      09/21/2019 at 2:17 pm

      Download the ipsw file in it’s about 1.50gb then restore it using itunes. I had the same problem. Now I’m running iOS 9.4.6

  23. Zain

    08/10/2019 at 8:42 am

    My dad was trying to update his 4s to the lattest 9.3.6 update and now it’s stuck at “connect to iTunes” screen.
    Any help would be appreciated. I have tried updating it through iTunes and some other third part softwares, but nothing helps.
    Went to DFU mode and tried to update through iTunes, no luck.
    Any help would be appreciated.
    [email protected]

    • JD Vynes

      08/22/2019 at 6:45 am

      I faced the same problem. Local apple affiliate store told me to download iTunes to my computer and then do restore. Did that and got an error 29 which turned out to be connected to the fact that I had a replacement battery that was not an apple original. Research said if I had original battery, to reinstall the original battery and then do restore with iTunes software. Unfortunately, I had thrown the original battery away. Ordered (3) broken (for parts only) iPhone 4s on eBay. Luckily, one of them had an original apple battery. Installed it on my 4s and did iTunes restore and all is well. Doubt I will ever do another update on this 4s that we only use as a back-up. Definitely will not throw this battery away if I ever replace it in the phone.

  24. Candy

    08/17/2019 at 7:01 pm

    I just tried to upgrade my 4S and now it won’t turn on. The apple logo appears for a few seconds and then vanishes. Tried to plug it in and restart on iTunes and nothing works. HELP!!

  25. Todd Koeppel

    08/26/2019 at 8:48 am

    Update to iOS 9.3.6 caused my phone to stop working. It just displays the “connect to iTunes” screen and when I try to either update or restore the iOS, it fails and gives me error (29).

    I’m very disappointed, because Apple just essentially broke my phone.

  26. Hector

    08/28/2019 at 11:15 pm

    You can return to ios 6.1.3 just download the fimware on this site and then restore itunes by pressing the shift key and the restore iphone button you search for the fimware file and select it.

  27. Smith

    09/15/2019 at 6:19 pm

    September 13, 2019 I got a notification from Apple to update my iPhone 4s software from iOS 9.3.5 to 9.3.6. Therefore, I proceeded to update and eventually got a screen on my iPhone that indicated I should connect my iPhone to iTunes. Once connected to iTunes I was given the option to update or restore so I chose to update. After some time a message came up telling me the phone could not be updated and I needed to restore it. I tried to restore my iPhone using iTunes and after some time I got the following message” the iPhone could not be restored. An unknown error occurred (29) “ I Googled and iPhone 4S users were having the exact same problem I was having with ios 9.3.6. Then they told each other that by putting the original iPhone 4S battery back in everything all of a sudden worked perfectly. It just so happened that I still had the original eight-year-old iPhone 4s battery from 2011 when I bought the phone. I couldn’t believe it would work but I was desperate so I installed the original eight-year-old battery and charged it for a half an hour, connected to iTunes, and to my amazement my iPhone 4s restored perfectly. Therefore, it’s clear that something about the original Apple iPhone 4s battery allows the phone to be restored and updated. Clearly, my iPhone 4s with a third-party battery would not update and would not restore making the iPhone 4s unusable. So, apple must know that an eight-year-old iPhone 4S would not have the original battery still in it, and they know if someone tries to update or restore the phone with a battery other than the original Apple battery the iphone 4s will be unusable.

    Now that iOS 9.3.6 is installed my iPhone works better than ever, no problems.

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