iPhone 4 Stuck in Reboot/Respring Loop

Jun 8, 2013
Ok so I have a 4 running 6.1.3 jailbreak that boots up to the lockscreen for like 5 sec and reboots all over again. I have tried it all, hold vol+, iTunes restore, tinyumbrella! I powered it off one day and when I went to reboot with iBooty(because of jailbreak)and the program says all is complete but my iPhone is not on. I tried iTunes and got 1601 & 1604 errors, powered pc off and restarted and got a error 21. Now the phone will not stay on unless connected to power source! Can someone please tell me if I killed it or is it fixable? Verizon cdma 32gig iPhone 4