Please help! Lost everything on the device.

Aug 28, 2014
HI everyone.

i got this phone 20 days back. everything worked fine. today i tried to download developer rom on it. after rebooting the device, i found that everything was deleted, there were no contacts, gallery was empty, no google services, no default browser, now i cant download anything in this phone. please help me out. i created a backup too before rebooting but i cant find that either. somebody help me as soon as possible. how can i get the phone working like before? >.< please reply fast, thanks in advance.
Apr 20, 2014
i think have no solution , just install a stable version !!! and developper rom isn't obligate to update MIUI v6 ^^
i try this morning and everything work fine !!