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boot.img file for OxygenOS 10.3.6 on the OnePlus 6T / OnePlus6T Global version.
This is STOCK from the official OTA update file OnePlus6TOxygen_34.J.48_OTA_048_all_2010042240_dbd576b615.zip. It's NOT patched for root by Magisk 20.4.
The OP6T is also known as fajita, but please bear in mind that this is NOT LineageOS or Cyanogen.