Kindlefire hd 2012 stuck at blue screen

My tablet already installed cm12 and twrp 2.8.7.0. After fully charged the tablets become slow and said something i cannot clearly remember "can't find sdcard" so decided to boot to twrp and it stuck at twrp blue screen. I've tried to normal boot again and it brought me bootloop (after stay at blue android robot's face 5 min). I used KFHD system.img restore tools but it sends back an errors about "write protection'. I've tried to replace recovery with fastboot command and it said success (fastboot -i 0x1949 flash recovery) but i think it brought no change to my tablets cause it stuck at blue twrp title again. Please help me now!!!!
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