I think it should be vol -, not vol +
Thanks PsYcHoKiLLa, just tried power on with menu & vol+ keys, unfortunately still nothing happends except the LED indicator comes on with continuous a red light.
Also tried this sequence with the USB cable connected to my PC, still nothing except the LED indicator flashes on & off with green light.
Does the working recovery given in Fuzzra's link (http://android.modac...flash-recovery/) allow reversal of the the unlock procedure assuming the unlock files were incorrect (see my original post)?
Or is there really only one chance at loading up the unlock files?