HTC Desire 516 dual sim ROOT FAILED (BRICKED?)

I've tried to root my HTC Desire 516 dual sim by following this guide: http://forum.xda-developers.com/android/help/bootloader-fastboot-recovery-htc-desire-t2845467/page8 But obviously, I did something wrong. Now, when I turn on my phone and unlock the screen, suddenly there is a message saying "Unfortunately, HTC Sense has stopped", and I didn't make a backup and now don't know what to do. Can someone help me to fix it? I cannot do anything on the homescreen or even to get in the app menu, only in settings menu. Also, when I try to wipe cache or go for the factory reset it returns a string saying "E: failed to mount/sdcard (no such file or directory)" I tried to find a stock ROM for this phone but seems that there's none on the internet.