Originally Posted by thsecmaniac
What is it different between billchen1977's rom and Sony's rom except Sony's is older than billchen1977's? I'm curious
These files are known as the vendor blobs. They are proprietary files whose source code is not available to the public. Some of these vendor files are used by various components of the phone like the camera etc. The ones on the Sony website are very old so if you use them, it is quite possible that the camera might not function properly. As Sony released official updates, if I remember, they even fixed laggy 1080p recording. So it would be much better to use the latest blobs.
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Xperia Mini ST15i > Xperia S LT26i > Xperia T2 Ultra Dual D5322