Flashing files over TWRP, ADB or fastboot has a slight potential for something to go wrong. Whether it's a user error or something on the developer side that is not quite right with the file you're trying to use, you might have some real issues with your device. In most cases, it is a semi-brick or soft brick that can usually be resolved by erasing the device's data with TWRP, but sometimes it is more severe than that.
If you ask most questions -time root users will likely have at least one story informing you of a bad file flash job that caused the device to be masoned in some way or another. Fortunately, the OnePlus 6T has a recovery method that can bring the device back from just about any number of bricked situations. This is the last lifesaving method and can be a lifesaver ̵
- OnePlus 6T (the recovery tool is not intended for other OnePlus phones)
- Windows computer
- USB data cable
If possible, start TWRP and deploy your internal memory with a computer to try to recover data that you might want to save. If you navigate through TWRP and deploy your device to the computer, drag and drop any files or folders you want to save. The Restore tool displays a inventory system image on your phone, which clears the device. If you do not have anything important on the phone, you can proceed with the next steps of the guide.
This recovery method is solely for running a program from the computer without using ADB or fastboot commands. For this to work, you must shut down your device completely. We would normally boot into TWRP or the bootloader to solve these problems, but the recovery tool is the final solution if everything else fails. The easiest way to make sure the device turns off is the bootloader menu and then the power off option. If you have turned off your phone completely, you can proceed to the next step.
The OnePlus 6T Restore tool will work on a single Windows PC. Make sure you have access to one to continue. To get started, you'll want to download the MSM Recovery Tool. This allows you to interact with the phone while it is turned off. This is extremely important as it is a unique recovery environment. The download includes the recovery program and system image for OnePlus 6T, so the initial download is almost 2GB.
If you previously connected your phone to your computer, you probably will not need to reinstall any drivers. You can manually download the drivers if Windows does not automatically detect the device in the later steps. Just download the drivers so you can have them handy soon.
Step 4: Install the drivers (if necessary)  After you have completed the downloads, go to the folder where you put the files on Computer have saved. If you know you need the drivers, start the OnePlus_USB_Drivers_Setup file and follow the instructions on the screen to install the drivers on your computer. Otherwise, you can continue without reinstalling the drivers for the phone.
Now unpack the "6T_MsmDownloadTool_v4.0.58" _OOS_v9.0.5 "file to any location of your choice , then open the extracted folder, the folder will display several different files, but the main focus is on "MsmDownloadTool V4.0_factory." Locate the application and open it to begin the next steps.
Before proceeding, make sure the MSM Recovery Tool is installed to open the status of your connection Do not worry about the other options and information the program displays, you do not have to worry about additional settings for the recovery process make ng.
Now you need to connect your phone to the computer with a USB cable, but the process is slightly different from what you might expect. To interact with the recovery tool, you must simultaneously press and hold the volume up and power down keys while connecting the USB cable to the computer.
I know it's a little different and awkward, but it requires the program to work. The easiest way I've found is to hold down both volume keys with a thumb and then connect the USB cable from the computer. You must hold down the volume keys at the same time before connecting the cable, otherwise it will not work properly.
Now check with the recovery program on the computer and if Everything went fine, in your "Connection Status" should be "Connected". Your COM number may differ from mine, but it all depends on which USB port you use for the connection.
Note: If the connection status is still N / A, make sure the phone is completely turned off and try using the volume key connection method again. You may even need to install or reinstall the supplied drivers for the phone from step 3.
After the connection between the program and your phone has been successfully established, you can now definitively move to the recovery process. Next, click on the "Start" button. You should see a download activity because the system image is being transferred to your device. This can take some time. Once the download process is complete, you will notice that your phone automatically restarts and is one or two minutes into OnePlus boot animation, which is normal.
When your phone goes down When you start up at the startup screen, you can click the Stop button in the recovery program and then click Exit to close the session break up. Your OnePlus 6T has just not been bricked and can be used as usual – no shiny paperweight for you! From here you can complete the initial setup of the device and then continue with your normal daily routine. The recovery tool flashes in Oxygen OS version 9.0.5, which means that you need to perform a system update after restarting.
The bootloader is locked again during the recovery process. So you need to start over like the first day, if you want to root and modde as before. It's important to find out if you want root access now or not. That way, you can protect yourself from another data wipe if you change your mind. Have fun with a usable OnePlus 6T!