For 10R only: I have uploaded a few of the extracted boot.img, before extracting if you want you can look for the required boot.img here:
www.mediafire.com
1. Download and extract payload-dumper-go.
2. Download and extract OxygenOS firmware zip. (You can find firmware zip for all OnePlus devices here or you can directly download full update zip from Oxygen Updater app.)
3. Move payload.bin from extracted firmware zip to the folder where you extracted payload-dumper-go.
4. To start extracting the img files, type cmd in the address bar and run the following command,
5. When the extraction is done, a new folder will be created with all the extracted img.

MediaFire
MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.
1. Download and extract payload-dumper-go.
2. Download and extract OxygenOS firmware zip. (You can find firmware zip for all OnePlus devices here or you can directly download full update zip from Oxygen Updater app.)
3. Move payload.bin from extracted firmware zip to the folder where you extracted payload-dumper-go.
4. To start extracting the img files, type cmd in the address bar and run the following command,
5. When the extraction is done, a new folder will be created with all the extracted img.
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