red square appearing in tablet screen

I have bought a dell venue 7 , 6 months ago and it was working fine till yesterday.

But today morning i found that a red square is appearing round the corner of the screen once a minute and the inserted microsim was not detected by the the device.although i inserted the sim in another device and it was working without any hassle.could you please tel me what had happened to the device?

이 질문에 답하세요 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

점수 0
의견 추가하세요