How to recover my old privouisly passcode to my iPhone

It sounds like you forgot your iPhone passcode. Please follow one of these two articles based on your case to reset your passcode:

iPhone is disabled: If you forgot your iPhone passcode or your iPhone is disabled - Apple Support

iPhone is unavailable: If you see a iPhone, iPad, or Apple Vision Pro unavailable message or Security Lockout screen - Apple Support

To proceed from here:

If you forgot your iPhone passcode or your iPhone is disabled - Apple Support

xer128 wrote:

How to recover may old passcode

There is no recovery, check the paper you wrote down the passcode one.