I need help changing the MAC Address and serial number of my Cisco Modem DPC-EPC3208. For me, only the internet connection is important. I don't use the VoIP connection/function on the device.
The modem was destroyed by a power supply overvoltage. The DC/DC converters IT7612M (see photos) are defective.
I bought a second used, identical and intact modem.
Since the devices are provisioned by my ISP with their MAC addresses and serial numbers, a replacement device cannot be operated without reprovisioning.
My idea is replacing the parts, where the MAC address and serial number are stored, from the intact to the defective modem.
To do this, I would need to know in which parts these data are stored.
Could it be the SPI spansion FL064PIF (see the EPC3208G)? Or maybe there is more than one flash chip, one for the BIOS/firmware and one for the MAC and serial number?
I think, this option is more promising than changing the DC/DC converter, because the overvoltage may have destroyed even more parts (SMD parts).
What do you think about my plan?
Background of the story:
My ISP, Vodafone, wants to get rid of the old Cisco modems of their cable network and in case of a failure, customers only get a so-called Vodafone station (modem-router combination) as a replacement device, which I don't want for various reasons. This station doesn't work properly in many cases. Some honest employees of Vodafone told me that they receive many customer complaints about this device and advised me to keep the Cisco modem as long as possible. My cisco modem has been running fine for over 10 years.