I have now upgraded to 9900jAllLang_PBr7.0.0_rel1948_PL5.0.0.610_A7.0.0.4 39_WIND_Canada
... and I have updated/corrected my carrier details on the other profile!
I shall wait a few days or so to see if a magic fix arrives, and if not - then I shall send my bricked unit back to the UK for some TLC.