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You will need to put the image on your phone. For this guide I'll assume it's on the sdcard named android.bmp.

1)Get into a terminal. You can do this via adb shell or using a terminal emulator on your phone. If you are using TWRP it's under Advanced for a Terminal.

2)

Code: su

Code: dd if=/sdcard/android.bmp of=/dev/block/bootdevice/by-name/splash

to root yourself. You don't need to do this if it's TWRP as you are already rooted.3)this will write the image to your phone