Brother GTX pro Instruction Manual page 215

(11) On the operation panel, press
Then, the white ink will be installed.
<TIPS>

When the white ink pouch runs low on its remaining volume of white ink, the Install Ink function can no longer get started.
Furthermore, there may be cases where the pouch needs to be replaced with a new one during the installation process of
white ink. If the remaining volume is 400 g (14.1 oz) or less, prepare a new white ink pouch, follow the instructions on the
screen to replace the pouch, and activate the mode again.

After the procedures are completed, the current screen will go back to the standby mode screen.
Precautions to keep good printing quality/use printer over the long term
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