[OnePlus 3T Guides, News, & Discussion] hypergamer1231:
Hello Friends

UPGRADE :

Heres a Step By Step Guide To Install The Latest Version Of Android And Hydrogen Os

For further convenience I have made a video guide.

[YOUTUBE]srSDyatQ-LU[/YOUTUBE]

Pre Requisites :

Backup all your data. (Internal Storage Will Be Wiped)

Make sure you have more than 50% battery.

Windows PC with internet.

Oneoplus USB cable

Steps :

1) Download https://drive.google.com/open?id=0BxSuTgRuPk_WQ1dQd01YTG5Wb1U

2) Extract using winrar only. If you use any other extracting software it wont work.

3) Download and install minimal adb and fastboot on pc https://www.androidfilehost.com/?fid=745425885120698566

4) Unlock the bootloader on your OP3T

5) Power off the device.

6) Go to the extracted folder of the ROM and run msmdownloadtool as a administrator

7) While the phone is off press and hold volume up and connect the phone to PC using usb cable

8) Go to device manager and ensure phone is connected as Qualcomm HS-USB 900E

9) In msmdownloadtool ensure your phone is detected and click on start

10) wait 5 to 7 minutes#

11) Once the tool shows flash completed disconnect the phone from PC and press the power button

12) first boot will take 5 to 10 mins so please wait patiently ( After first boot if you wish to have a unlocked Bl please unlock it now and then proceed to setup the phone as it will erase everything when you unlock BL)

13) Set up the device and uninstall/disable all unwanted chinese apps except market

14) open market and install google play store from there

15) once play store is installed you may choose to disable market app

16) Install this apk https://drive.google.com/file/d/0BxSuTgRuPk_WSnE2TE9GX2xmNTQ/view

17) download all requiered apps from play store and reboot the phone

18) Enjoy stable Android 8.0 on your device

DOWNGRADE (Restore Stock OOS 4.5.0 And Relock Bootloader :

watch this video for easier step by step instructions

[YOUTUBE]X7A_VUtXkFI[/YOUTUBE]

Download Links :

Minimal Adb And Fastboot : https://androidfilehost.com/?fid=745425885120698566

Restore Firmware : https://mega.nz/#!Q1YnTTAT!gnLf6NEkSRy7W-WY8J0H2SmJJLzO91-vReKx7B1VVpI

Oxygen Os 4.5.0 : https://drive.google.com/file/d/0Bz_uDPdezFwGYi1EYlJZcDV0YkU/view

1) Backup All Your Data And Make Sure Phone Is Atleast 50% Charged

2) Download All 3 Files From The Links Above

3) Install Minimal Adb And Fastboot

4) Extract Restore Firmware To A Folder On Desktop

5) Go to settings > tap build number 7 times > go back > go to developer options > enable oem unlocking

6) power the device off

7) press and hold vol up + power to enter fastboot mode

8) connect your phone to pc

9) open minimal adb and fastboot and then type fastboot oem unlock

10) highlight yes on your phone using volume up and press power to confirm

11) wait for recovery to erase all data and once the phone boots up power it off

12) open msmdownload tool from the extracted restore firmware folder

13) while the phone is off press and hold the volume p button and connect the phone to pc

14) once detected go to device manager and under ports make sure device is detected as qualcomm HS-USB QLoader 9008

15) Go to msmdownload tool and ensure one of the fields says com device and press start

16) Once the tool says download complete disconnect the phone and press the power button to boot into os.

17) Congratulations you are now on official OOS with Android 6.0.1

18) From here you can choose to install ota and go to OOS 4.5.0 or follow the steps below

19) Once on the home screen copy the oos 4.5.0 file to the phones internal memory

20) power the device off and press and hold vol down and power to enter recovery

21) select english > select install from internal storage > select oos 4.5 zip and confirm install

22) reboot to OOS 4.5.0 with a complete stock experience.

If this thread helped you please press thank and please like share and subscribe to my youtube channel.