Apple Stops Signing iOS 15.4.1 Following iOS 15.5 Release, Downgrading No Longer Possible
Following the May 16 launch of iOS 15.5, Apple has stopped signing iOS 15.4.1, the previously available version of iOS that came out in late March. Because iOS 15.4.1 is no longer being signed, it is not possible to downgrade to that version of iOS after installing iOS 15.5.
Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date, so it is not unusual that iOS 15.4.1 is no longer being signed.
iOS 15.4.1 was a minor update that addressed an issue that could cause the iPhone's battery to drain more quickly following the iOS 15.4 launch. It also addressed an AppleAVD issue that could allow an application to execute arbitrary code with kernel privileges, which Apple said was actively exploited.
iOS 15.5 added an Apple Cash feature for requesting and sending money, along with new features for Podcasts and a fix for an issue with home automations. It also included several security updates, and those who have not already upgraded to iOS 15.5 should do so for that reason.
Popular Stories
Today's the day! Apple is about to release iOS 26, which will deliver the biggest redesign since iOS 7 and bring a range of new features and improvements to iPhones worldwide. It's Apple's biggest software update of the year, and Apple announced at last week's iPhone event that it will be releasing iOS 26 sometime today – Monday, September 15.
Based on past releases, the update is likely...
Apple's annual September event is now in the rearview mirror, with the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, iPhone Air, Apple Watch Series 11, Apple Watch Ultra 3, Apple Watch SE 3, and AirPods Pro 3 set to launch this Friday, September 19.
As always, there is more to come. In his Power On newsletter today, Bloomberg's Mark Gurman said Apple plans to release many products in the...
The latest iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air models are equipped with Apple's all-new N1 chip for Wi-Fi 7, Bluetooth 6, and Thread connectivity. However, the chip has a Wi-Fi 7 bandwidth limitation.
According to FCC documents reviewed by MacRumors, the N1 chip in all of the new iPhone models supports up to 160 MHz channel bandwidth for Wi-Fi 7, short of the...
iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air pre-orders began at 5 a.m. Pacific Time in the U.S. and many other countries today. If you have yet to place a pre-order, you might face a longer wait now, depending on your desired configuration.
As of shortly after 6 a.m. Pacific Time today, nearly all iPhone 17 Pro Max configurations on Apple's online store in the U.S. are facing ...
Apple's new Live Translation feature for AirPods will be off-limits to millions of European users when it arrives next week, with strict EU regulations likely holding back its rollout.
Apple says on its feature availability webpage that "Apple Intelligence: Live Translation with AirPods" won't be available if both the user is physically in the EU and their Apple Account region is in the EU....
Apple will launch its new iPhone 17 lineup and ultra-thin iPhone Air in stores on Friday, September 19, and the company has already shown off the new devices at its fall event, which ran with the the tagline "Awe dropping."
The iPhone 17 series brings a host of new features and enhancements. Here's a rundown of the biggest upgrades and changes:
iPhone 17
Display Changes
The iPhone...
iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air pre-orders began on Friday in the U.S. and many other countries. iPhone 17 Pro Max delivery estimates quickly slipped beyond the Friday, September 19 launch day for those who had yet to place an order, and now the rest of the new models have started to follow suit.
As of shortly after 11:30 a.m. Pacific Time today, select iPhone 17, ...
Apple continues to phase out the physical SIM card tray on iPhones, with the latest models relying solely on eSIM technology in more countries.
The new iPhone 17, iPhone 17 Pro, and iPhone 17 Pro Max support eSIMs only in these countries and regions, according to Apple:
Bahrain
Canada
Guam
Japan
Kuwait
Mexico
Oman
Qatar
Saudi Arabia
United Arab Emirates
Un...
T-Mobile President Jon Freier today shared real-world photos of Apple's boxes for the iPhone Air, iPhone 17 Pro, and iPhone 17 models, which launch on Friday.
Image Credit: Jon Freier
Apple has typically included iPhone box renders in its product environmental reports, but it did not do so for the latest models. However, Apple's iPhone Upgrade Program page does offer some images of the boxes, ...
