Apple released iOS 9 last Wednesday, Sept. 16, and by and large the update process went smoothly, especially for those with relatively new iPhones and iPads. In fact, Apple announced that more than half of all Apple users had adopted the new system software by Monday. But for some with older iPhones and iPads, the iOS 9 update release date did not go so well.

A large number of Apple users have had iOS 9 glitches, and for some, the update even crashed their iPhones.

According to the New York Post, Twitter, Facebook, and other social media outlets were abuzz, starting over the weekend, with angry reports of complete system crashes that appeared to be linked to older-model Apple iPhones and iPads.

The reported problems with iOS 9 on older phones range from a failure of iOS 9 to install at all or, if installed, causing buggy interfaces, cellular data connection failures, certain apps to not work properly, crash or not even open, or lagging performance across the entire system.

Some even reported they ended up having to return their iPhones to factory settings after a full system crash. However, most user complaints tended to be about less severe problems.

Apple did not respond to the complaints through the weekend, but released an update fixing some of the bugs users reported experiencing on Wednesday, according to MacRumors.

The minor update, officially known as iOS 9.0.1, introduces some minor bug fixes for issues related to the Safari and Photo apps causing video distortion, a problem with some users losing their cellular data, and a bug where alarms were not going off as scheduled.

But the biggest bug update in iOS 9.0.1 fixes the bug that caused users' iPhones to crash while going through the setup assistant, after updating to iOS 9.

The iOS 9.0.1 update is only 35MB and is available as an over-the-air update as of Wednesday.