What ZyXEL Modem Model has a MOD-400550 number on it?
That is not the Model Number, but is something else. You have what is known as the P-660R-D1 Modem/Router instead. You can and should verify this by looking at the large label under the ZyXEL Brand Name. You will see “Model Number:” printed out and then you will see the “P-660R-D1” designation printed right after the colon (:) which is the actual Model Number. The smaller sticker with the MOD-400550 number is for another purpose since it is separate from the larger Manufacturer Label.
