That is the exact right energy for this project! You're about to become the person who *can* do it. And the best part? You're right about the safety net—for a OnePlus 6T, a «brick» is almost never permanent.
Here's the super lazy, but also the super safe, way to do it.
### 🛡️ The Ultimate Safety Net: MSMDownloadTool
Before you even download the postmarketOS files, do this one thing. Download the **MSMDownloadTool** for the OnePlus 6T . This is the official, low-level recovery tool from OnePlus.
* **It's Your «Undo» Button:** Think of it as a factory reset on steroids. No matter how badly you think you've messed up the software, this tool can flash the phone back to a completely stock, out-of-the-box state . It works even if the screen is black and the phone appears completely dead.
* **How it Works:** You put the phone into **EDL (Emergency Download Mode)** by holding both volume buttons while plugging it into your PC, and the tool does the rest . It's incredibly simple.
* **Just in Case:** One user on XDA made it a rule to have this tool ready *before* flashing anything, saying it «saves your ass if something bricks» . This is the ultimate peace of mind. Even if postmarketOS doesn't work out, you're only ever 10 minutes away from having a working OxygenOS phone again .
### ⚡ The «Super Lazy» Installation Steps
With that safety net in place, the actual installation is straightforward. Here's the condensed version :
1. **Prepare Your Phone:**
* Charge it fully.
* Go to `Settings -> About Phone` and tap «Build Number» 7 times to unlock Developer Options.
* In `Settings -> System -> Developer Options`, enable **OEM Unlocking** and **USB Debugging** .
2. **Unlock the Bootloader (This wipes your phone):**
* Reboot into fastboot mode by turning the phone off, then holding **POWER + VOLUME UP + VOLUME DOWN** until you see «START» on the screen .
* Connect it to your PC and run the command: `fastboot oem unlock` .
3. **Flash postmarketOS:**
* Download the correct `boot.img` and `userdata.img` for the **OnePlus 6T (fajita)** from the official postmarketOS site .
* With your phone back in fastboot mode, run these commands :
* `fastboot erase dtbo` **(This is the key step that breaks Android on that partition)**
* `fastboot flash boot * `fastboot flash userdata * `fastboot reboot` 4. **First Boot:** * The first boot may take a few minutes. The default PIN is `147147`, and the default username is `user` . ### ⚠️ A Note on Risks and «Mistakes» You asked if mistakes can be dangerous. With the MSMDownloadTool ready, they're mostly just time-consuming. * **The Main Risk:** The postmarketOS installation process wipes the `dtbo` partition, which is why Android won't boot from that slot afterward . This can be confusing, but it's not a «brick.» If you ever want to go back, use the MSMDownloadTool, or you can use a more advanced manual flashing method . ### 🎉 Final Thought Your friend pointed you toward a powerful idea. The fact that you can install a full Linux distribution on a phone is incredible. And the fact that it's almost impossible to permanently break a OnePlus 6T means it's the perfect device to try it on. You've got this! Let me know if you get stuck or when you get it booting
* **A Known Bug:** Some users on the OnePlus 6T have reported high CPU usage and overheating when using the GNOME Mobile environment with the `systemd` init system . If you run into this, try using a different environment like **Phosh** or the `OpenRC` init system, as the bug wasn't present there . This is the spirit of tinkering!