How to unlock a disabled iphone?

My brother decided to get a new phone, and said that i could have his old one, but that i could only have it it i figured out the password. After constant guessing based on the what i thought he might have used, i finnaly ended up on the disabled: connect to itunes screen. He hasn't given me the charger for it because he knows there's ways to easily hack it or something if it can connect to the computer. Is there anyone who can help me with this, either by telling me how to get in with my current situation or at least get rid of the disable to try guessing again.idc if i have to reset the entire phone to do it

Try the key that came in the box.

Let me google that for you

This method involves booting the device in Recovery mode and performing full data wipe. In other words, it will be a fresh installation of purchased apps and music.

In this scenario, if you try to connect the device with iTunes, you will receive the following error message:

How to Restore a Locked and Disabled iPhone or iPad
Now, you have to place the device in Recovery mode manually, as follows:

Unplug the sync cable from your device
Switch off your device (hold the power button down and slide it to power off)
Press and hold the Home button and plug in the sync cable
Continue to hold the Home button until you see "Connect to iTunes". When you see this message, release the home button.
Now, iTunes will Restore the device to factory settings. In other words, you'll have some work to do to get things back to normal.
NOTE: If you do not have a backup and want to restore your purchased apps and music, check out Apple's support article on how to download your purchased software.

There's many other ways

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