Original post by: Minho ,
You could ask the customer...if they're technically oriented, they may have noted this info for their router or their router config might contain it. Normally, all of that information is in the Settings/About page. While it's probably too late now, it's always a good idea to take a snapshot of that page before trying to remove the NAND. That way if you damage the NAND trying to remove it, you'll have the info at hand. This actually happened to me just this week.