Netgear cg3100 firmware upgrade

I bought a 2nd hand netgear cg3100 modem. but the firmware of this modem has been changed by an internet provider and I cannot use it here. I searched for the original image of this modem on its page. but it does not exist as an image file. I need help on how to find the image file for this modem?

Please contact Netgear support regarding OEM firmware for this device.

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