Every single month, Google and other manufacturers send out updates to Android devices containing the latest crop of fixes for the security issues on the platform, and this month's patch has just started making its way to unlocked HTC 10 devices in North America. With the June security patch now rolling out to users, the update will be hitting devices throughout the day and likely throughout the week. Of course, the security patch is not the only part of this update as it also contains performance improvements and bug fixes to look out for, so overall the user experience should get better.
As stated, this update contains stability improvements for the unlocked model of the HTC 10 in North America, so if you were having stability issues prior to this update things should end up getting a little better, although if you haven't noticed any general instabilities then you may not notice any changes post update. Bug fixes are included as well, and when it comes to the security fixes it should include everything that was part of the initial June security patch that started hitting Nexus devices earlier this month.
There isn't much in the way of detail with the HTC 10 changelog for the firmware update, but it is fairly hefty weighing in at 304MB in file size, so as always, it's recommended that you have more than half your phone's battery life and have the phone hooked up to a local WiFi connection before attempting to go through with the download to move to the new software version, which should bring users forward to 1.80.617.1. Since this is just for the unlocked model of the HTC 10, there is no telling how much longer it may take for the carrier models to get this firmware update let alone the unlocked and carrier models in other regions. If you have the HTC 10 but it is not an unlocked model, or it's an international model, you can always check or the latest firmware updates manually by going into the about phone section from the settings menu, and then tapping on software update to see if it shows up for your device.