I want erase my iPhone 11 pro without computer

If you had iOS 15.2 or higher you could without using a computer but since you are on 12.5.5, you must use a computer to restore.

Ask a friend or relative if you can use their computer or go to an Apple store and ask to use one of theirs.

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

akinnusi209 Said:

"I forgot my iPhone 11 pro password how can I erase it without computer"

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Get this Serviced By Apple:

You'd take it to the Apple Store, and have them reset this. You'd set up a Genius Bar Appointment at your local Apple Store, using this link: Genius Bar Reservation and Apple Support Options - Apple.

Apple Support Contact Info:

• Contact Us - Choose Locations
• Proceed from there as necessary
• Note: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

Genius Bar Appointment:

Notes on This:

Bring some notes, your original proof of purchase, and create a backup prior to bringing it in. Important: Be certain to create a backup of your iPhone prior to bring it in. That way, you can have something to restore your iPhone from, should anything go wrong during the service or afterwards. Though not necessary, bring the power adapter along, in case theirs does not work.