There is a good topic on this: 
https://forum.openwrt.org/viewtopic.php?pid=152222
Turns out the region is 0x0002 for worldwide. If you have a WNDR4500 yourself, 
try running routerinfo, it will give you the information you need.

20.06.2012, в 0:19, Rafał Miłecki <[email protected]> написал(а):

> I wanted to generate chk image for WNDR4500. For that I need to hack
> target/linux/brcm47xx/image/Makefile
> 
> For chk files mkchkimg is used with 2 parameters I've to find out:
> board_id and region. My guess is I have to extract that parameters
> from stock (original) firmware to understand what my router accepts.
> Is that right?
> 
> For that purpose I've downloaded WNDR4500-V1.0.0.103_1.0.21.chk and
> opened it in hexeditor. Checking range 0x28 - 0x39 gave me a board_id
> (it was easy to find). It seems to be:
> U12H189T00_NETGEAR
> 
> Unfortunately I don't know where to look for region. Does someone know
> it's location in .chk file, or is there a application to automatically
> extract it?

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