We are going to fix a iPad Air2 today, the main problem is that the screen is blurred, it reboot again and fails to enter into the system. It's a common problem on iPad devices. It's not a big problem if you have enough repair experience. How shall we repair it? Let's follow the article step by step! First of all, we connect the iPad 2 on computer and reflash it by iTunes, error 4013 is reported, so we judge the problem comes from flash memory. Dissaemble the iPad Air2 by iPad opening toolkit , and take off the iPad motherboard, we found the iPad NAND chip was repaired before, so we remove the Nand chip and reflash again, the error code is reported again. So we are going to directly repair flash memory. After the flash memory is installed, it's normal when reflashing again, the invalid SN is reported. If the invalid SN is reported, it basicall...