How to upgrade the DVR ?

Step:
	1, copy the file: DVR8_appV20 or DVR4_appV20 to root folder of the usb flash disk;
	2, plug in the USB flash disk to DVR and change the language to english then restart it ;
	3, there is a note displaying on the screen ,wait about 5 mimutes do not power off ;
	4, after upgrading, please reload default setting from MAINMENU--ADVANCED--MAINTAIN.
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if you can not upgrade it, please modify the file name to "DVR4_app128" or "DVR8_app256"