Fear of chinese stock firmware. If you didn't root/unlock bootloader/flashed anything onto the tablet and it just stuck on boot, then the firmware is terribly developed. Try either flashing another Rom or take it to a service shop.
Phone: Sony xperia sp (c5303)
Android version: 4.1.2
Kernel version: 3.4.0-perf-g1285c6c-01149-g40c437a BuildUser@BuildHost) ) #1 SMP PREEMPT Wed Aug 14 17:10:55 2013
Baseband version: 8960A-AAAAATAZQ-40031007-13
Build number: 12.0.A.2.254