iOS 26.5.1 ― Bug Fixes, Changes, and Improvements

[Banglazed]

iOS 26.5.1​

Release Date ― June 1, 2026
Build Number ― 23F81
Darwin Kernel Version ―

This update addresses an issue for a small number of users that may prevent wired charging on iPhone Air and iPhone 17 models when the battery is nearly drained.

iOS 26.5 Beta Release Notes

New Issues
Remaining Issues
Resolved Issues
Features
Additional Notes

• Developers and testers can report bugs using the Feedback app. If you put your settings back on “None” for the betas, you can still open the app by entering the following URL in Safari:
  

  applefeedback://

• iOS 26 Overview
• iOS 26 Press Release
• iOS 26 Release Notes
• iOS Beta Release Notes
• iOS Security Updates

Spoiler: Modem Firmware

• iPhone 17 series: 1.60.02
• iPhone Air: 2.05.04
• iPhone 16 series: 2.60.00
• iPhone 16e: 2.02.03
• iPhone 15 series: 3.50.08
• iPhone 14 series: 4.51.04
• iPhone 13 series and iPhone SE (3rd gen): 5.51.02
• iPhone 12 series: 5.10.01
• iPhone 11 series, iPhone SE (2nd gen) and iPad Air (Cellular, 4th gen): 6.50.00

Spoiler: Carrier Version

Australia

• Optus - 64.5.8
• Telstra - 64.5.13
• Vodafone AU - 70.0

Belgium

• BASE - 33.0
• Orange B - 58
• Proximus - 45.0
• Telenet - 66.0

Brazil (info updated 26.5RC, last change in 26.5RC)

• Claro Brasil - 70.0
• Vivo - 70.0
• TIM -
• Oi - declared bankrupt in Nov 10th 2025

Canada

• Bell - 62.8
• Fido - 56.0
• Fizz - 53.0
• Freedom/Shaw Mobile - 54.8.6
• Mint Mobile - 58.0
• Public Mobile - 54.8.4
• Rogers - 70.0
• Telus - 54.8.8
• Videotron - 53.0
• Virgin Mobile - 50.0

Denmark

• 3 DK - 46.7.11
• TDC 69.5
• Norlys 69.5

Finland

• DNA - 58.5.7

France

• Bouygues Telecom - 40.0
• Orange France - 70.0
• Free - 70.0
• SFR -

Germany

• Vodafone.de - 70.0 and RCS enabled
• Telekom.de - 70.0 and RCS enabled
• o2-de - 61.6.1 RCS enabled

Greece:

• Cosmote - 38.0

Guatemala

• TIGO GT - 49.0

India

• Airtel - 58.5.18
• Jio - 69.0 (iPhone) and 58.5.18 (iPad)
• Vi India (Vodafone Idea) - 58.5

Ireland

• Eir - 33.5
• Vodafone IE - 38.0

Mexico

• AT&T - 57.0
• Telcel - 57.6

Morocco

• Orange - 50.0

Netherlands

• KPN - 70.0
• Vodafone NL - 68.0
• Odido - 68.0

Poland

• T-Mobile - 64.5.4
• Orange - 64.5.2
• Play - 61.0
• Plus - 61.0

Portugal

• Vodafone P - 40.0

Romania

• Orange RO - 55.0

Slovakia

• Orange SK - 57.6

Southeast Asia

• Singapore Singtel -
• Philippines Globe - 70.0
• Philippines Globe (iPad) - 38.0
• Philippines Smart - 70.0
• Thailand AIS - 53.0
• Thailand DTAC - 53.0
• Malaysia Umobile - 33.0
• Malaysia Maxis -33.0
• Malaysia Digi -
• Malaysia celcom -
• Hong Kong - 32.0
• Taiwan -

Spain

• Orange ES - 70.0
• DIGI ES - 54.8.4
• Vodafone ES - 54.8.8
• Movistar - 70.0
• Yoigo - 70.0

Sweden

• Comviq -
• Tre - 31.0

Switzerland

• Salt - 58.0
• Sunrise - 70.0
• Swisscom - 70.0

Turkey

• Turkcell (Lifecell) - 36.5.5
• Vodafone TR - 32.0
• Turk Telekom - 32.0

United Kingdom

• BT-UK (EE MVNO) -
• EE - 70.0
• Giffgaff (O2 MVNO) -
• iD Mobile (Three MVNO) - 69.5
• Lebara (Vodafone MVNO) - 67.5.1
• Lyca (EE MVNO) -
• Mozillion (EE MVNO) - 67.0
• O2-UK - 69.5.2
• Sky (O2 MVNO) - 69.5.1
• Three - 69.0
• Virgin Mobile (O2 MVNO) -
• Vodafone UK - 64.5.5
• Smarty (Three MVNO) - v70.0

United States

• AT&T - 70.0
• Boost - 57.0
• Cricket - 60.5.5
• FirstNet - 55.0
• FirstNet (iPad) - 41.7.6
• Metro (TMO MVNO) - 70.0
• Spectrum (VZW MVNO) - 70.0
• T-Mobile - 70.0
• TracFone/Straight Talk/Walmart Family Mobile - 63.5
• U.S. Cellular - 46.7.24
• Ultra/Mint Mobile (TMO MVNO) - 64.5.16
• Verizon - 70.0
• Visible (VZW MVNO) - 70.0
• Xfinity Mobile - 67.5.1

Other

• Docomo - 32.5.10
• AlwaysOnline -

Historical beta release chart

iOS Version History Chart

iOS version history chart

www.thinkybits.com

 

[Hans300]

Only for iPhone 17 and Air ?

 

[Banglazed]

Might only be for iPhone 17 models

 

[gtmead09]

iPad isn't showing anything yet. iPhone showed it over 10 GB but downloaded like a few hundred MB. Originally it said it had 26 mins to download but it was done in like 2 mins.

 

[Artemiz]

Build# 23F81

 

[atlchamp]

Is it normal for an update like this to be 10 GB on iPhone 17 Pro?

 

[ValerieDurden]

Is it normal for an update like this to be 10 GB on iPhone 17 Pro?

10.81GB on my 17 Pro Max, very big update.

 

[Hans300]

Useless if its only for iP17.

I bet there would have been other bugs to be fixed for all.

 

[Cobold]

Useless if its only for iP17.

Well, apparently not for 17-series users… 😂

 

[James6s]

Just under 11GB on my iPhone Air, update didn’t take long.

All good on the other side. Smooth and snappy, some apps are definitely opening and loading content faster (not done a restart for a while) so maybe that’s why.

 

[NUFC2025]

Didn’t catch the size of the download in my 17e but it was done in a couple of minutes so it was not a very big one.
How come some people are reporting multiple gigabytes?

 

[smokedotter]

My 16 PM is not showing an update available.

 

[yeahtyeaht]

My 16 PM is not showing an update available.

It's 17 only

 

[robohunter]

IPSW links are up on the dev site (for all models back to the iPhone 11) but only the links to the Air and 17 series currently function

 

[Reeneman]

Is it normal for an update like this to be 10 GB on iPhone 17 Pro?

Had the same. It’s a mistake. The update size for these incremental OTA update is more or less broken since the whole iOS 26 releases.
The unpacked update file was around 900 mb on my phone. The download was even smaller.

 

[Jakimo]

Wow, mine says 18.55 GB - iPhone Air. And it's available for Mac (MBP M5) as well..

 

[TheByteSmasher]

12.2 GB for iPhone 17 Pro

 

[TheByteSmasher]

Also.. I seem to be having connection issues. Reset mollified but didn’t fully fix it 😞

 

[Glenn1]

Way to go Apple…”fix” a problem and create a bigger one: now I can no longer connect to the WiFi at all after installing 26.5.1. They better pull this so called update asap.

 

[ValerieDurden]

Update has been great so far no issues, and still running really smooth but as always time will tell.

 

[Mikepeer]

Apple CarPlay still causing problems. Unbelievable for a company like that.

 

[Jakimo]

Apple CarPlay still causing problems. Unbelievable for a company like that.

Yep, still has never worked so well with Teslas =)

I just mount it to the left of the screen, I kinda feel like Woz when I do that. Do your remember early GPS days, that photo of Woz with seven GPS units all going at once in his car so he could see how they all did together? haha

 

[Reeneman]

Way to go Apple…”fix” a problem and create a bigger one: now I can no longer connect to the WiFi at all after installing 26.5.1. They better pull this so called update asap.

Seems a specific issue on your phone.
Just re-add the WiFi and it will most likely be ok.
No need to pull anything.

 

[Reeneman]

12.2 GB for iPhone 17 Pro

Please see my comment above. The OTA update is much much smaller. The size that is shown on the update screen is mostly broken/not precise in the whole iOS 26 era.
The file was unpacked around 900 mb on my 17 Pro, the packed download was also much smaller than this.

 

[ValerieDurden]

Can still report this update is running absolutely fantastic, smoothest I’ve seen iOS 26, there are definitely more changes than just a charging issue, feels like the iOS I remember back when I had my 13 Pro Max on iOS 16.