This is something this forum does not deal with , basically getting your device flashed is as far as i can help you with , in order to get your device online , you will have to look into modem hacking sites , but i can tell you this , with the newer security about on most ISP's , you cannot just change a serial# and HFC , you need the correct/relevant certs for that HFC , the minute you alter a HFC mac on a device , you break the chain cert. Google sbhacker i believe they deal more with these issues.