extrend

I have dug out my old ET8500 however it is dual boot. I cant for the life of me get it to flash. i seem to remember that i had to do something with the power button. can anyone remember how to flash this?

I have an extrend et10000 box with openvix on it... Been having massive problems with my broadband which they traced to a short in the street.. However I now have a problem caused by the box... I have to keep flashing with the newest build but it only lasts about 3 weeks before my internet...