Camera iphone 4 cdma blank after upgrade to ios 7.1

camera iphone 4 cdma blank after upgrade to ios 7.1, before update to ios 7.1 all camera working good (front and rear) but after upgrade my rear camera still black screen but front camera was fine.
help me plis

Hello, hidrahmat. 
Thank you for visiting Apple Support Communities. 
This article will help your troubleshoot the camera issue with your iPhone.  See the section labeled Camera isn't functioning or has undesired image quality.
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
If the issue persists, see the last section labeled Issue not resolved.
Cheers,
Jason H.

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