It seems a lot of OnePlus 3 and OnePlus 3T users have had trouble flashing the new OOS 4.0 and getting it rooted without getting the dm-verity error on the new file system, F2FS.
A hat-tip to Reddit user r0cky, who has posted this guide to flashing OOS 4.0 on your OnePlus 3 or OnePlus 3T device.
Please note the changes for 3T highlighted in red, and use the appropriate commands for your device.
Preparation
What you need beforehand:
- A freshly flashed OnePlus 3/T with OOS 4.0 and the Stock recovery. If you get the dm-verity message you have to reflash the stock recovery first boot into fastboot and flash it via “adb flash recovery recovery_OBT8N.img” (without the quotes) and then from within the recovery select ADB sideload and on your computer enter into the terminal “adb sideload OnePlus3Oxygen_16_OTA_035_all_1612310359_e10cadfb2af7.zip” (change for 3T)
- ADB and Fastboot: https://forum.xda-developers.com/showthread.php?t=2317790
- SuperSu: https://download.chainfire.eu/1017/SuperSU/SR1-SuperSU-v2.79-SR1-20161221223537.zip
- TWRP (Modded blu_spark v3.0.2-1.28) https://forum.xda-developers.com/devdb/project/dl/?id=21835
Installation
- Reboot your OP3/T to fastboot and connect it to your pc
- On your computer type into the command line while you are in the folder you placed your recovery: “fastboot boot twrp-3.0.2-1.28-oneplus3.img” without the quotes.
- When it asks to write to your system click ‘Read only’ and type the following command without quotes: “adb push SR1-SuperSU-v2.79-SR1-20161221223537.zip /”
- Now into TWRP choose Install and go to the root there you find the SuperSu file at the bottom flash it and reboot
- The reboots again don’t interrupt this process.
If everything worked you should be booted into a freshly rooted OOS 4.0 with no dm-verity error message.
Hopefully, this will help more OnePlus 3 and OnePlus 3T get on the new OOS 4.0 that runs Android 7.0 Nougat. OnePlus officially started rolling out an OTA on December 31, 2016, but a full rollout typically takes a few weeks. You can use the above described method to flash your phone to the new OS version.
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