Hi again,
I found the way to upgrade to version 1.8.3 7969b13
this is a juan software here is the link http://pan.baidu.com/s/1kTqPy5p#dir/path=%2FJUAN%20upgrade%20softwares
But you must pay atention to your software version because you can break your device.
This is a compatible firmware for the sl-dvr4-4600
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