Delete PassWord ADB sideload

Hi everyone,

i have an old samsung galaxy grand plus from a friend. He forgets his android password so we can't access to the device.
Of course we could just data factory reset the device but he'd really like to get his data back before.

So i've been to recovery mode, and selected apply update from adb.

Now i'm on the screen "Now send the package you want to apply to the device with "adb sideload <filename>"..."

i have android sdk installed, but I'm not very familiar with adb , so any idea the way i could/delete or reset the password?

i guess the android version is 4.4.4 (KTU84P.I9060IXCU0AOD1 ?)

Thanks in advance for the help you could give me.

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