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
Apple's iPhone 17 Pro and iPhone 17 Pro Max models will feature a number of significant display, thermal, and battery improvements, according to new late-stage rumors.
According to the Weibo leaker known as "Instant Digital," the iPhone 17 Pro models will feature displays with higher brightness, making it more suitable for use in direct sunlight for prolonged periods. The iPhone 16 Pro and...
Apple will be holding its annual iPhone event on Tuesday, September 9, to unveil the iPhone 17, iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max.
Assuming that Apple sticks to its familiar pattern, the iPhone 17 series should be available to pre-order starting Friday, September 12 at 5 a.m. Pacific Time / 8 a.m. Eastern Time. The release date for the devices should be one week later, on Fr...
We're only days away from Apple's "Awe dropping" fall event scheduled to take place on Tuesday, September 9 – and along with the new iPhone 17 series, we're going to get a new version of the Apple Watch Ultra for the first time since 2023.
By the time the Ultra 3 is unveiled, it will have been two years since the previous model arrived. The intervening period has left plenty of room for...
iOS 26 introduces an Adaptive Power Mode on the iPhone, alongside the existing Low Power Mode.
Apple says Adaptive Power Mode can make "performance adjustments" when necessary to extend an iPhone's battery life, including slightly lowering the display brightness, allowing some activities to "take longer," and automatically turning on Low Power Mode when the iPhone's remaining battery life...
Apple is set to unveil the iPhone 17 series in just four days from now, and the biggest design mystery surrounding the Pro models has finally been solved.
In a report outlining his expectations for Apple's event next week, Bloomberg's Mark Gurman said the iPhone 17 Pro models will have "a new cutout area on the bottom two-thirds of the phone that doubles as the wireless charging area."...
Just one week before Apple is expected to unveil the iPhone 17 series, an analyst has shared new price estimates for the devices.
Here are J.P. Morgan analyst Samik Chatterjee's price estimates for the iPhone 17 series in the United States, according to 9to5Mac:
Model
Starting Price
Model
Starting Price
Change
iPhone 16
$799
iPhone 17
...
Apple's upcoming iPhone 17 Air will have a $1,099 starting price providing 256GB of base storage and will max out at $1,499 with a 1TB option, according to the latest TrendForce report.
Apple will offer three price/storage tiers for the all-new ultra-thin iPhone 17 model, which replaces last year's iPhone 16 Plus in the lineup. Here's how TrendForce sees them breaking down:
256GB — $1099...
