"e:signature not verified" when trying to install stock ROM on Galaxy S3
I'm on holiday in the UK and have just bought a S3 I9305 LTE off ebay which is running stock 4.1.2 and is sim locked to T-Mobile.
I'm trying to downgrade it to 4.1.1 so I can try this method but getting stuck with the Samsung logo (a boot loop??) when I try to flash any stock 4.1.1 ROM (have tried 3 different ones so far - EE in the UK, Vodafone NZ and Portugal)
Have tried via Mobile Odin, desktop Odin and CWM Recovery with no luck.
With CWM an actual error message can be see which is the "e:signature not verified" message. But either my googlefu is weak or there simply isn't that much info on this error.