[OnePlus 8 Guides, News, & Discussion] kurogami555:
Warning

Follow this guide at your own risk, I will be not held responsible if your device gets brick (which it is already is that's why you here 😂), catches fire, explodes or gets any form of damage. Also, you will LOSE the data.

Acknowledgment

I own nothing, I just wanted to compile a proper guide so that people don't waste time searching for solutions as I did if they encounter this issue.

All the credit goes to

@Some_Random_Username @thattechguy_69 @semdoc

Thank you so much for providing tools, guides and files.

Links to their guides where I got helped from

[OP8][OOS TMO 55CB] Unbrick tool to restore your device to OxygenOS

[OP8][OOS 21AA/BA/DA] Unbrick tool to restore your device to OxygenOS

[GUIDE] Complete Step-by-Step Convert T-Mobile to Global (or other) firmware

How to recover your device after flashing incorrect DDR xbl images

Some information about issue

So, I made a mistake flashing custom rom where I flash my OP8 partitions with wrong imgs and my device got bricked, no Qualcomm 9008 detection on pc, no EDL mode, no booting, no fastboot no nothing. The only solution I found by looking around was to replace mobo until I found the guide for deep edl cable. It revived my device again

BTW this guide is for OP8 but theoretically it can be used for another OP devices or in general devices with Qualcomm SOC as mentioned in the Hydra Cable. So do check the compatibility below listed maybe even if your device is different, it could be saved.

Please share your result if anyone tries it for other people.

View attachment 6125044

Things you will need

1. Hydra EDL cable v2, this is called a Deep Flash Cable which in a simple way puts the device in EDL directly without button combo or edl test points.

I ordered from AliExpress Hydra EDL v2

2. Windows 10/11

3. Bricked OnePlus device

4. MSM Tool (Make sure to download the correct one as per your device and region I am putting link for OP8 T-Mobile only as it's my device T-Mobile)

You can find OP MSMTools here Unbrick Tools

5. Qualcomm Drivers

6. OnePlus Drivers

Steps

1. Make sure you have you leave your device on charging for at least 4-5 hours as I had issue with this as my battery was dead from being bricked for 2 weeks and it was having issues getting connected.

Another option is if you can remove your backglass just unplug the battery and then proceed, this is what I did personally.

2. Make sure no extra USBs or any other device is connected to PC

3. Before installing drivers run these two commands one by one in terminal admin mode and restart your PC

3a. bcdedit.exe /set nointegritychecks off

3b. bcdedit.exe /set testsigning off

4. Uninstall any previous drivers if any

4a. Install Qualcomm drivers

4b. Install OnePlus drivers

4c. Restart your PC

5. Unzip the MSMTool in a folder with a short path like D:/OP/MSMTool

5a. Run MSMTool (and in target dropdown select correct one as for me it was TMO)

Now here is the tricky part where you have to be fast as device jumps out of EDL in 10ish seconds, so read this first.

Press the button on the Hydra Cable and first insert it in device and while keep pressing the button insert it in the PC

As soon as you hear windows detection sound click on ENUM on MSMTool

You will see COMX connected (X is the number of port it can vary pc to pc)

Then immediately click start

If everything goes well then in 300s it will flash completely and reboot.

Cleanup

To remove windows Testmode watermark run these two commands one by one

Bcdedit.exe -set loadoptions ENABLE_INTEGRITY_CHECKS

Bcdedit.exe -set TESTSIGNING OFF

Some Suggestions

1. Try different USB ports if not getting detection especially try USB 2.0 ports

2. Try to change port number of Qualcomm device in device manager if it gets detected there but not in MSMTool, try larger port numbers. Google it how to do it.

3. MSMTool creates a temp folder in C:/ so delete it if you try to start fresh again

4. Have patients I wasted 2 weeks to revive my device so I know it can get frustrating but have hope as

THERE IS NO COMPLETELY BRICKED OP DEVICE ITS JUST WE DON'T KNOW THE SOL YET.

Good luck and please share your experience this is how the community thrives. Thank you.