That's the exact same circuit board as the 4500.
Matter of fact, I just compared the numbers in it to those in the photo from figure 4 and everything was the same except the manufacture date.
Now the differences between the DGL-4500 and the 825 are this.......
- 4500 = 1 mini-PCI WiFi card
- 825, 855 = 2 mini-PCI WiFi cards
With the 4500, the Bnc (antenna) connectors are attached to the plastic housing. With the 825, the Bnc connectors are soldered to the circuit board.
- 4500 has only one LED on the front and an OLED Screen on top
The rest of the differences aren't really much to bother with.