I guess it's because the firmware it's not the right one
This ROM's old man.After installing over oxygen oreo update, the device touch freezing so many times, what is the problem, help me please
ROM:
*This update will not install if you are using outdated firmware (if you cannot install this update, then flash the Firmware file from the Downloads section)
*Camera: Fixed photo not getting saved when exiting the camera app before the photo is saved
*Camera: Added warning message when Anti-shake mode is enabled
*Camera: Anti-shake mode will automatically turn off every time the Camera app is closed
*Camera: Fixed low frame rate when recording video (video now records at 30 FPS instead of 24 FPS)
*Camera: Removed HDR mode from front-facing camera (unstable and OxygenOS does not have it)
*Updated proprietary libraries from OxygenOS 3.5.4 for the OnePlus 3T
*Fixed audio randomly not working until the device is rebooted (this is fixed by forcing everyone to use updated firmware)
*The 'Prevent accidental wake-up' option no longer stops the power button from waking the device
*Updated AudioFX app from CM nightlies
Kernel:
*Fixed 'Prevent accidental wake-up' option never turning off
*Updated CPU underclock: reduced big cluster maximum frequency to 1824 MHz (1824 MHz is much more efficient than 1920 MHz)
*Synced with CAF LA.HB.1.3.1.c1-20100-8x96.0 (security fixes)