When the OnePlus One debuted back in 2014, it was sold as an enthusiast phone with insane bang for the buck. Fast forward four years, and Android 8.1 Oreo in the form of LineageOS 15.1 has just been released for it. The OPPO Find 7a and Find 7s and Galaxy S5 Plus/LTE-A are getting 15.1 as well, and the Huawei Ascend Mate 2 4G has returned with LOS 14.1.
It's no secret why CyanogenMod is the most popular custom ROM out there; not only does it support a metric crapload of Android devices, but it also keeps them going far past their primes. The latest devices to get support for CM14.1 (Android 7.1 Nougat) nightlies include two variants of the Galaxy S III, the second-generation Moto X, a few Oppo devices, two versions of the HTC One Max, two Xiaomi phones, and more.
If you've got a Find 7 or Find 7a phone from OPPO and you're itching for an official Lollipop ROM, head on over to the company's user forums. A beta version of Color OS 2.1, running on top of Android 5.0 code, has been posted for you to download. At the moment this edition of the software is not available via an over-the-air update, though that should be coming soon enough.
Oppo announced the Find 7 in two flavors a few months ago, but it only sold the lower end Find 7a until now. Preorders are finally live for the Oppo Find 7 with a better screen, more RAM, and more storage. It'll also cost you a little more money, but not as much as you might expect.
A little clarification: according to a member of the CyanogenMod team, the release for the Find 7A may also work for the Find 7, the more premium model with a 2560x1440 screen, among other hardware upgrades.