It used to be a firm rule here that we didn't help people crack devices, but frankly I think they're now so old that nobody will care...
That said, I don't know
how to do this, but if you're willing to extract the flash and fiddle with it it's probably straightforward to bypass. You'll need to build a cable and use a Linux tool. See
http://cowlark.com/amstrad/index.html. Stupidly I got rid of my E2 and E3 a while back so I can't really help. Interesting devices, though; I might attempt to acquire another one off ebay... they're probably not expensive any more!