So, i unlocked the bootloader about a month ago and was running an MIUI rom just fine, no issues what so ever, today i removed the rom, and just went back to stock android, I tried to change the system font with an app called "fontchanger", and now the phone will not boot, when i power up the phone, i never even get to the nexus loading screen, it gets stuck on the Google screen, If i hold the power up button and the power button to get into the the diagnostic menu, i get the options to reboot bootloader, reboot, recovery, and power off, when i try to go to the recovery menu, i get the triangle with and exclamation mark logo. When i plug the phone into the computer PDA net recognizes that the phone is plugged in, but if i try to interact with the phone at all the phone reads at the very bottom, Fastboot FAIL not a valid command. Can anyone please help me, i cant seem to get any response over at XDA.