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I want to build LineageOS 15 from source following the titan image build guide which requires the transfer of vendor specific files and thus an adb connection after enabling USB debugging.

I didn't find a LineageOS-specific guide on turning development tools including USB debugging on, so I went with my Android knowledge of tapping 6 times on the build number in the phone settings. This shows a screen with my home screen background and the LineageOS emblem. The emblem responds to taps anywhere on the screen by changing it's styling, but nothing else. I can go back and use the phone including repeating the journey to the emblem screen.

I get that these settings should be hidden for non-dev users and don't need to be reachable very intuitively, but that's covered by hiding the function behind the 6 taps on the version item. After that the proceedure to enable development features can be intuitive again.

  • Just a side note on building (which is off-topic on this site, so not included in answer): don't follow the official guide on vendor blobs, instead add TheMuppets to your local manifest for known-good extracted blobs. – Andy Yan Apr 12 at 3:18
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I went with my Android knowledge of tapping 6 times on the build number in the phone settings. This shows a screen with my home screen background and the LineageOS emblem.

Despite what you claimed, you've tapped the wrong place. Tapping "Android version" will show a big N; tapping "LineageOS version" will show you the LOS logo; tapping the actual "Build number" item, which is the second-to-last item in the About phone menu, is what you should go for.

On top of that, it should be tapped 7 times, and each tap should notify you about needing more taps to unlock Dev Options.

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I tapped something else than the build number. There's a lot of room for improvement here, unfortunately, LineageOS developers don't care about suggestions of improvements in their issue tracker.

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    It's unreasonable to blame LOS for misreading / mistake on your part, unless it's because you're not using English and got mislead by translation. – Andy Yan Apr 12 at 3:16
  • The showed logo made me think which is always a bug. I can't discuss this with the LineageOS devs because they refuse input on this because of the automation of their issue tracker. It's reasonable to complain about this - especially if I accept the outcome of this discussion or its postponing no question asked. – Karl Richter Apr 12 at 8:15
  • The GitLab issue tracker is just that, a serious place for discussing issues, with concrete proof (usually logcat). For lighter discussion you should've used their official subreddit instead, which is way more open. Maybe also offer video proof on where you tapped and what popped out, because I had/have dozens of LOS devices and I know well how it works. – Andy Yan Apr 12 at 14:55

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