Photo vault password

Hello akkii288,

Welcome to Apple Support Communities. We understand that you want to change the passcode to review your hidden photos in Photos. We are happy to help.

The Hidden Album in Photos uses the same passcode that you use for your phone or Face ID or Touch ID. If you have forgotten the passcode to your iPhone, you can use the steps here to reset it: If you forgot your iPhone passcode - Apple Support

"Make sure that you have a computer (Mac or PC)

Turn off your iPhone

Put your iPhone in recovery mode

Restore your iPhone

Need more help?

Learn what to do if you see an error when you update or restore your iPhone, iPad, or iPod.

If you can't complete any of these steps, if you're still prompted for a passcode, or if you need any other assistance, contact Apple Support."

Here’s more information on hidden photos: Hide photos on your iPhone, iPad, or Mac with the Hidden album - Apple Support

"Unhide photos on iPhone or iPad

1. Open Photos and tap the Albums tab. On iPad, you might need to tap the sidebar icon in the upper-left corner first to see your albums.
2. Scroll down and tap Hidden under Utilities.
3. Use Face ID or Touch ID to unlock your Hidden album.
4. Tap the photo or video that you want to unhide.
5. Tap the More button  then tap Unhide."

These steps may help. Please let us know if you have further questions.

Take care.