Hi, I know this is an old thread, but I'd like to flash some GP688 to GP388. I have a working home made flash adaptor that I have successfully updated firmware on several sets but wondering what the process is to change models. I'm sure I've seen it in the past but cant seem to find it now. Thanks i...

I understand this is possible, which would be great to achieve. Could anyone advise exactly what I would need for this or even flash this for me?

Any advice / assistance anyone could give would be most appreciated.