Default [Q] [I9100g] Deleting Cryption Meta Data

Hello,
I'm asking for help...after years of loyal service, my Galaxy S2 (i9100G) it started to crash to the home screen. I had read various topics for a possible solution, after trying the wipe cache I was forced to a format factory, but immediately the phone is stuked, and appears this inscription: "Deleting Cryption Meta Data" and then the screen returns to black.
... any ideas to solve?

Thank you so much to everyone!