Firmware updating on DAHUA DVR0404LE-A

[acaro 0]

Wondering if anyone can offer some help on how to update the firmware on DAHUA DVR0404LE-A. I'm trying to update from 2.606 to 2.608 and I keep getting a upgrade fail message when I try to use the USB updater method (I changed the file name to update.bin as instructed). I've used different USB sticks and formatted using FAT32 and it keeps failing. I also tried to do it over the network using the 1.16 upgrade tool. Using the network tool, I am able to successfully log on and get a file successfully uploaded message (I renamed it to update.bin and also tried using the original name -General_DVRxx04LE-AX(DVR310XE)_Eng_N_V2.608.0000.1.R.20120215), after selecting the BIOS button, but the DVR itself still shows the old firmware at 2.606. Any help would be appreciated.