NEED HELP ASAP! GETTING ERROR ON RSD LITE, PLEASE HELP ME.

I was flashing my girlfriends phone from Verizon Wireless to Cricket and when I was flashing it, it finished saying (ERROR FLASHING SUBSCRIBER UNIT DEVICE A. And the phone is now stuck on boot loader mode and I can't get it out of boot loader mode. Please if anyone knows how to fix this problem please help me out I would appreciate it very much, thanks in advance.