I'm using Ubuntu Yakkety Yak, 16.10.

According to Android SDK manager: Android SDK Tools v 25.0.3 Android Build Tools v 25.0.2 Android SDK Tools v 25.2.5

My phone is a OnePlus 3t and I'm developing for it for a while, adb works normally, udev rules are configured. I enabled OEM boot, and manage to reboot in a way which looks like to me fastboot. After rebooting to "fastboot" the device's USB id is exactly the same as in normal boot. That's suspicious because I read in some forums that it might be different after fastboot boot (I checked if I have to adjust udev rules).

fastboot devices

doesn't show any devices. My suspicion is that I don't really boot into fastboot mode. Here is capture when I reboot, I press the power button:

fastboot screen capture

If I don't press the power button, the up/down offers recovery mode. In recovery mode I can wipe all data or the cache and also install from internal storage or ADB. data decrypts successfully. Needless to say I cannot install SuperSU, TWRP img doesn't appear in that install menu.

(My goal is to unlock the bootloader, install TWRP and SuperSU so I can perform the xml file config mod for DayDream.)

Any help is appreciated.

  • I'm amazed BTW how nicely OnePlus is tinkerable as opposed to my old Galaxy Note for example. I'm sure it's some glitch with my setup we'll overcome soon. – Csaba Toth Feb 20 '17 at 7:53
  • Found someone who did it successfully: android.stackexchange.com/questions/166033/… – Csaba Toth Feb 21 '17 at 22:29
  • I disconnected the device while I was rebooting. – Csaba Toth Feb 21 '17 at 22:29
  • The screenshot is fastboot, you should be able to unlock and then install TWRP image. – Édouard Lopez Feb 22 '17 at 10:46
  • I know. But fastboot devices shows nothing so I cannot issue the oem unlock. I'll try to tinker until I succeed. – Csaba Toth Feb 22 '17 at 18:28

I misunderstood what does it mean to boot to fastboot mode. By reading through tutorials I thought when I saw the screen on the screenshot, I still needed to boot (power button) into fastboot mode. Turns out that when I saw that screen above, I was already in fastboot mode and could issue the unlock or flash commands.

Looking at some more detailed Youtube videos made that clear. After tackling a typo I successfully flashed TWRP, installed SuperSU. The OP3 DayDream mod is not working yet though: DayDream apps still displayed as not compatible with my phone in the app store, even after the XML modification and reboot.

One extra advice: a simple adb backup -all won't backup everything, as I learned.


During 2017 summer I managed to get the DayDream hack working, I used SuperSU. I just transitioned to Magisk, so I can use Android Pay and hardware tokens. The DayDream hack does not work since the last couple of OS updates in the fall.

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