Bootloader flash problem

[Guest Tech]

I was wondering if anyone can help me.

I have upgraded my phone to WM2005 successfully.

I wasnt able to backup the original ROM bcos orange have done something to 4.2.1.1 and wont allow you to use the r2sd all command (states that i dont have the correct proper security level)

So, I am trying to flash back the 4.2.1.1 ROM. However it cannot seem to establish a connection.

So I thought I could do an emergency flash of the nbf file however typhoonnbftools reports and error:

Immediate Flash test failed (Unknown error -2146893818 in read operation)

Any ideas?

Would I need the WM2003 file in order to flash it to the phone using mtty?