[OnePlus 7T Pro (Regular & McLaren) Guides, News...] astroarchcraft:
In this guide, ill be showing you how to install a custom rom onto your OnePlus 7T Pro device. Ill be assuming your phone is completely stock and you haven't done any modifications. This is done at your own risk, i am not responsible for corrupted images, bricked devices etc.

*NOTE: This guide is for the OnePlus 7T Pro only*

What you will need:

A windows PC - idk buy one lol? *NOTE* You will need a Windows 10 PC, Windows 11 can't recognize your phone in fastboot for some reason. You can manually install the adb drivers to the PC If you must use windows 11.

Platform tools SDK - https://developer.android.com/studio/releases/platform-tools

USB cable that came with the phone

Derpfest ROM - https://sourceforge.net/projects/derpfest/files/hotdog/ (This was made by @NurKeinNeid, It's truly an amazing rom and would recommend it to anyone who wants android 12 on their devices! XDA forum for the ROM - https://xdaforums.com/t/rom-12-0-derpfest-for-oneplus-7t-pro-official-hotdog.4250469/ ) Download the .img.zip, not just the .zip!

Orange Fox Recovery - https://orangefox.download/device/hotdog

Payload Dumper - https://androidfilehost.com/?fid=818070582850510260

Custom Flashing Script - https://github.com/AlaistairP/Install-Scripts

Step 1: Unlocking your Bootloader.

(i) In order to install software onto your phone you must have an unlocked bootloader. To start, go to settings - about phone - tap on the build number 7 times, input your password and developer options should then be enabled.

(ii) Then go into the main settings page - system - developer options. Enable the 'OEM UNLOCKING' feature. After that scroll down and enable USB Debugging. At this stage, plug your device into your pc. A dialogue should come up to allow the computer to connect to your phone, click yes.

(iii) Now on your computer, navigate to the platform tools folder you downloaded, in the main directory with all the files, in the search bar type cmd and press enter. You now need to boot your phone into fastboot mode. To do this, turn your phone off. Then, hold the power button with the volume up and down button! You should see a menu with green text saying 'Start' at the top.

(iv) Plug your phone into your computer, and in the cmd menu you opened, type 'fastboot devices', you should see the word fastboot followed by a string of numbers. Now type - 'fastboot oem unlocking' A dialogue will appear on your phone, using the volume keys select the option to unlock the bootloader. *NOTE - ALL DATA WILL BE REMOVED'

Step 2: Flashing a custom recovery

Reboot your phone to fastboot, then connect your phone to your pc. Type in 'fastboot reboot fastboot' your device should reboot into 'fastbootd' Now using the recovery.img file you downloaded from Firefox, type the following command, `'fastboot flash recovery 'PATH TO RECOVERY.IMG FILE'

Once the file has flashed, restart your phone into fastboot mode and using the volume keys, navigate to recovery mode. You should now boot into Orange Fox recovery. Now, in orangefox, go to Wipe - Format Data - then type yes and wait for the process to finish.

Voila!

Step 3: Flashing the ROM!

Open your downloaded version of derpfest, you should see a file called payload.bin, place that into the payload dumper input folder, then run the programme and wait for it complete, you should have loads of .img files. Copy all of these into your platform tools folder! Now download the custom script and place that into the platform tool folder as well.

Reboot your phone into fastboot mode, and once again type 'fastboot reboot fastboot' Once you're in fastbootd mode, right click the flash-all.bat script and run as admin, click more info if you have microsoft defender and click run anyway, The rest is done in the script!

*HOW TO UPDATE*

Once you have downloaded and extracted the new files from the most recent payload.bin file which the dev releases, copy these files into your platform-tools folder. You need to make sure there are no .img files from the old Rom remaining. Now, connect your phone to your pc. Open a cmd windows inside the platform-tools window and type 'adb reboot fastboot', once your phone has entered fastboot, type 'fastboot reboot fastbootd' Once your in fastbootd, simply run the update.bat script and voila!

After, reboot your phone and you should load into your new Android 12 OS!

If you have any questions please dont hesitate to ask!

If i have made any mistakes in this guide, or you guys think i should make any changes, let me know, im new to this! :)

*NOTE - I intend to make a full video walk through soon, ill have the youtube video linked here in the near future*