I've not done that for Triton, but I've done that for my Yamaha S90. Just follow the instructions VERY CAREFULLY. And make sure you don't have a power failure that shuts down the keyboard in the middle of the upgrade. You'll end up with a dead keyboard.
If you're really afraid, you can bring it back to City Music to ask them do it for you. If they made a mistake and made your Triton dead, they will have to give you another one...
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