Error when saving to flash

@Gordon a dead end ?

Connected
>
>dump()
pinMode(D29, "input_pulldown", true);
=undefined
>for (var i=(120-3)*4096;i<120*4096;i+=32) {
:  var s = i.toString(16);
:  for (var x=0;x<32;x+=4)
:    s+=" "+("00000000"+peek32(i+x).toString(16)).­substr(-8);
:  console.log(s);
:}
75000 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
75020 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
75040 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
75060 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
  ...
77f60 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
77f80 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
77fa0 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
77fc0 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
77fe0 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff deadbeef
=undefined
>save()
Disconnected