galaxy s4 active sgh-i537 need help asap

Hi all im new to xda and i have a big problem i was trying to flash lollipop 5.0 to my phone with the firefly app i believe its called and once it was rebooting the phone never turned back on now i cant use my phone it only goes to recovery mode and download but wont turn on or charge i was originally on 4.2.2 and had it rooted..please i really need my phone back asap..any help would be appreciated.thanks