Oppo officially confirmed the ColorOS 17 global launch for October 13 next week, and OnePlus just opened up registrations for OnePlus users to get an early taste of the software. Notably, this isn't the final build of the software that OnePlus is seeding, of course, it's the ColorOS 17 Open Beta. For now, only Indian users can apply and get early access, and the application window is running from October 9 through October 12, just a day before the official release.
If you are eligible for an update, make sure to back up your data before installing because it's not a final build, so...
Source: GSMArena · Summarized by HeadlinesBriefing