Metro test MPAT 600

Does any one know how to reset the above pat tester back to factory code.
The factory code was SUPA but I changed the code and I now can not change it back.
I changed the main code (SUPA) and user 1 code. I set them both to them same code. but when I enter code into PAT tester, it will only allow me in as user 1, It will not let me log in as the main user so this means I can not change any settings.
Does any one know how to reset to factory code, (like when you reset a alarm panel)

Cheers Steve

 

any HELP please, any ex engineers who used to work at metro test Durham

 

had it calibrated, but they didn't know how to do it, I believe metro test do not exist now as its an old PAT tester my own daft fault for putting both codes the same

 

Yes I have the manual cheers, but it does not tell you how to reset code

Thanks Steve