factory reset my iphone without apple id passcode

Hello,

I understand you want to preform a factory reset on an iPhone without the previous owners Apple ID or password.

You can follow this guide to learn how to factory reset your iPhone: https://support.apple.com/en-us/HT201274

However, it isn't possible to factory reset the iPhone without that information, I may suggest you get in contact with the previous owner.

You cannot. To do that you must first sign the active AppleID out of iCloud on the device. And that requires the AppleID password.