well this would seem too dumb but here goes nothing
i've downloaded some fonts via a font application to change the wrinting of my keyboard, it has seemed to be great but i wanted to go back to the normal font i couldnt so i ve deleted the font files of the used font and rebooted my device and suddently an error saying "Unfortunetly, samsung keyboard has stopped working and when i tried to change the font i couldnt access the menu and the phone takes me back to home screen, i have even tried to redownload the same font and no results, than i've tried to clear cache and data and as usual no clue . my last hope was to try the hard reset but the error still appears after rebooting

can anybody lend to me a hand.

PS my device is samsung galaxy GT-I9505