Apple has just seeded the second beta of watchOS 4.3.1 to developers for testing purposes, two weeks after releasing the first watchOS 4.3.1 beta and three weeks after releasing watchOS 4.3.
At the time of publication, it is not known what is new in the pre-release software. However, considering watchOS 4.3 was just released and welcomed new features like Portrait Mode for Nightstand Mode, as well as a few other additions, this new software is probably just meant to address any behind-the-scenes issues that have cropped up since the public launch of watchOS 4.3 last week.
Shortly before watchOS 4.3.1 was introduced, Apple stopped allowing developers to update Apple Watch apps built on the original watchOS 1 SDK. In watchOS 4.3.1, there’s an alert when launching a watchOS 1 app that warns that the app may not be compatible with future versions of watchOS. This suggests Apple may drop support for watchOS 1 apps entirely in the future, just as it did with support for 32-bit iOS apps in iOS 11.
They will need to make sure that the necessary configuration profile has been installed before they will be able to download and install the pre-release software to test out. To update, the Apple Watch needs to have at least 50 percent battery, it needs to be charging, and it has to be connected to the iPhone. For developers who already have the registered configuration profile installed, they can find the new software by going to the Watch app on their iPhone, then opening General –> Software Update.
If any new features are discovered in the new software, though, we will update this post accordingly. There will likely not be a public beta of watchOS 4.3.1, so the public will have to wait until Apple releases watchOS 4.3.1 out of beta to try out the new software.