[Q] Unlock pattern-blocked phone - No internet, not rooted

Hi there!
I have searched for a while now, and I think I need a little help form you guys...
A friend of mine got her phone locked because she had failed to enter the correct pattern several times. Unfortunately, there is no Internet connection enabled, so the gmail-verification doesn't work. The phone is not rooted, and USB debugging is not enabled. I thought I could solve it by putting some files on its sdcard, but there seems to be an internal sdcard partition (when I remove the physical sdcard, I still have a big list of files in Recovery Mode > apply update from sdcard...

Is wiping everything my last chance ?

The phone is a Samsung GT-S6802B.

Thank you for your answers

MiluX

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