It looks like someone is maintaining an unofficial LineageOS fork here. There doesn't seem to be a lot out there, unfortunately. DivestOS being discontinued was quite a big blow to some of these older devices.
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Wow, that looks great, thanks! I did look on xda, but I missed this one because it's in the OnePlus 3 forum and I only looked in the OnePlus 3T forum.
Good to see that there's still development going on for this device, and with decent privacy/security too, I like.
I did look on xda, but I missed this one because it’s in the OnePlus 3 forum and I only looked in the OnePlus 3T forum.
Yeah I only found it by following links from an older (closed) thread which was posted on the 3T forum. Very easy to miss.