Update firmware on
OnePlus Nord N200

1. Download the latest Android 12 full stock ROM update from Oxygen Updater
2. Extract stock ROM using payload-dumper-go
3. Boot up OkcarOS recovery
4. Go to “Advanced” -> “Enter fastboot”
   warning

   警告: The “Enter fastboot” option may not be present on older OkcarOS 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 bluetooth bluetooth.img
   fastboot flash --slot=all core_nhlos core_nhlos.img
   fastboot flash --slot=all devcfg devcfg.img
   fastboot flash --slot=all dsp dsp.img
   fastboot flash --slot=all featenabler featenabler.img
   fastboot flash --slot=all hyp hyp.img
   fastboot flash --slot=all imagefv imagefv.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 oplusstanvbk oplusstanvbk.img
   fastboot flash --slot=all qupfw qupfw.img
   fastboot flash --slot=all rpm rpm.img
   fastboot flash --slot=all tz tz.img
   fastboot flash --slot=all uefisecapp uefisecapp.img
   fastboot flash --slot=all xbl_config xbl_config.img
   fastboot flash --slot=all xbl xbl.img