Go into recovery and follow the steps on this site http://xda-university.com/as-a-user/...rom-a-bootloop
This should help
Device: Sony Xperia SP C5303 (huashan)
Rooted: yes
Bootloader: unlocked
ROM: AOKP 4.3.1
Kernel: AOKP Kernel
Recovery: ClockworkMod 6.0.4.6
Busybox: BusyBox v1.21.1
Bootlooped: 6 times
All Apps: 98
Root Apps: 32
Xposed Modules: 18
Special Apps: ViPER4Android FX 2.3.2.2
Special Apps: ViPER4Android XHiFi 2.1.0.2

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