Update firmware on
OnePlus 6T

1. Download the latest Android 11 full stock ROM update from oneplus.com or Oxygen Updater
   info_outline

   Note: Oxygen Updater app usually happens to have newer releases available as OnePlus website tends to lag a bit.
2. Extract stock ROM using payload-dumper-go
3. Boot up LineageOS recovery
4. Go to “Advanced” -> “Enter fastboot”
   warning

   Warning: The “Enter fastboot” option may not be present on older LineageOS recovery builds and it cannot be substituted with “Reboot to bootloader”.
5. Execute following commands:

   fastboot flash --slot=all abl abl.img
   fastboot flash --slot=all aop aop.img
   fastboot flash --slot=all bluetooth bluetooth.img
   fastboot flash --slot=all cmnlib cmnlib.img
   fastboot flash --slot=all cmnlib64 cmnlib64.img
   fastboot flash --slot=all devcfg devcfg.img
   fastboot flash --slot=all dsp dsp.img
   fastboot flash --slot=all fw_4j1ed fw_4j1ed.img
   fastboot flash --slot=all fw_4u1ea fw_4u1ea.img
   fastboot flash --slot=all hyp hyp.img
   fastboot flash --slot=all keymaster keymaster.img
   fastboot flash --slot=all LOGO LOGO.img
   fastboot flash --slot=all modem modem.img
   fastboot flash --slot=all oem_stanvbk oem_stanvbk.img
   fastboot flash --slot=all qupfw qupfw.img
   fastboot flash --slot=all storsec storsec.img
   fastboot flash --slot=all tz tz.img
   fastboot flash --slot=all xbl xbl.img
   fastboot flash --slot=all xbl_config xbl_config.img