Some of you might realize that while the modem works properly after following my previous post, you can’t upgrade it using the original firmware from ZyXEL. Repeating what I said in the original post, you can’t upgrade the firmware to use the official ZyXEL version because of the built in firmware.
For those of you who have some electronics experience a lot of time to spare, I’ve summarized the steps on how to change Telefonica’s P-660HW-61 firmware to ZyXEL’s original version.
Note that in the steps below, you will void your warranty and you may brick your device. I am not liable for the damages caused by this post.
FYI, I bricked my modem in my first try. You have been warned.
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