All codes for anyone who needs it!
Padcode for the room at the end of the hall upstairs: 1989
Fio's Phone Code: 2310
Cabinet next to Fio's bed: 1702017 (It's A1702 + B017)
White Room: 20082020 (You can access this in the main menu)
Corner next to Fio's room: 4632916 (This is for the debug menu!)
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Other things I got stuck on that you might need help with!:
When in the room at the end of the hall upstairs, after looking under the bed 'sofia' comes to kill you. You respawn in Fio's room.
To pass this, once you have finished looking under the bed, you must go to the closet in the room before 'sofia' arrives.
This way you will be able to hide in it while she comes in.
When you obtain the present from the table downstairs, go to the room with the light switch in.
On the mirror there is a note, switch the light off to see the full note.
If you are still confused: Head to the bathroom upstairs and click on the sink, open the draw and you will find a bucket.
Head to the kitchen and fill it up with water. Place the water in the trash can in the kitchen. Repeat until the trash can is filled with water. Then place the present inside the water filled bin.
Hoped this helped!!!