METHOD 1
This method is the best method and will not wipe your data at all and will give you stock recovery and latest OxygenOS (or the ROM you were on) and bootloader will remain in the state it was earlier. It *might* not work if some other partitions were also corrupted.
Step 1 : DOWNLOADS :
Qualcomm USB Host Drivers 1.00.11
Recovery Tool
3.) [OPTIONAL : Will be required only if you don't have a working system]
Extract Drivers and Recovery Tool files on Desktop.
Press the power button for 40 seconds to turn off the phone.
Press only volume up button for 10 seconds and while keeping it pressed, connect your phone to PC. Keep volume up pressed till your device shows in device manager as [Unknown Device, QHUSB_BULK (under Unknown Devices) or Qualcomm HS USB ...... (under COMs and Ports)].
Right Click on your device in the device manager and select Update Device Software. Choose the .inf file manually from x86 or x64 folder as the case implies and select Qualcomm 9008 from the listed devices.If you are unable to see 9008,see the end of post for various other methods to show Qualcomm 9008.
When the device shows as Qualcomm 9008 ,go to the extracted Recovery Package and run the MSM Download Tool as administrator.
Click start at top left corner and wait for it to finish (green text will come).
Disconnect phone from PC and boot into system.
NEXT STEPS ARE TO BE FOLLOWED ONLY IF YOUR OP3 DOESN'T BOOT INTO SYSTEM STILL BUT IS STUCK ON ONEPLUS LOGO
Boot your phone into recovery (Power + Volume Down).
Click on Install Update or ADB Sideload.
Install adb for windows system-wide if not already installed :
Navigate to the folder containing Latest OxygenOS Zip.
Open an command window (Win + R : cmd.exe) and type :
adb sideload OnePlus3Oxygen_16_OTA_xxx_all_xxxxxxxxxx_xxxxxxxxxxxxxxxx.zip
(your OxygenOS.zip) and wait for it to finish. Then reboot into system.
METHOD 2
This method is easy to use and flashes OxygenOS 3.1.2 on your phone. It wipes all your data (See end of post on how to not wipe data) and restores all partitions to stock. It will work in any condition unless it is a hardware damage.
------------------Follow Step 2 to Step 9 from Method 1 --------------------
How to Prevent Data Wipe in Method 2
Extract the Recovery Tool.
Open all rawprogram...........xml through Notepad++
Delete all userdata........ lines from the xml file. DONE !!!
Troubleshooting : Make the device show as Qualcomm 9008
Make sure driver signature enforcement is disabled.
Try these drivers,one of them might work too :
- Keep phone disconnected from PC.
- Open the folder "qc" and install the Test Certificate in the following Stores:
- Trusted Root, Trusted Publisher, Third-Party Root and Personal
- Run the Qualcomm setup wizard (also located in the qc folder)
- When completed, restart your PC again with Driver Signature Disabled. (Optional but preferred)
- The driver should now automatically install. If not, go to device manager and right click "Unknown Device" and click "Update Driver" Search up the QC folder and press ok. The driver should now install.
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