I have an AT&T M8 that I have been using on Rogers network. It was SIM unlocked by flashing a config.dat file a while, it has S-off and I was running the vanilla HTC ROM on it because I liked HTC sense.
I decided to update to Marshmallow and flashed the SkyDragon ROM on it. It worked beautifully and my Rogers SIM card works fine. However, trying to use an AT&T SIM card (while in Canada as I want to activate it as I've done with other GoPhone SIMs), I'm not able to get any signal. I am somtimes able to search for a network (sometimes the option is greyed out) but when I clicked on Rogers, it just says "Operation Not Allowed".
It looks like the config.dat method has been patched
H-BOOT version is 3.19
Did I lose my SIM unlock?
How can I get it back - downgrade? Going to GPE ROM? Am I screwed?
Why does my phone work with Rogers and not AT&T as it was originally an AT&T phone?
I decided to update to Marshmallow and flashed the SkyDragon ROM on it. It worked beautifully and my Rogers SIM card works fine. However, trying to use an AT&T SIM card (while in Canada as I want to activate it as I've done with other GoPhone SIMs), I'm not able to get any signal. I am somtimes able to search for a network (sometimes the option is greyed out) but when I clicked on Rogers, it just says "Operation Not Allowed".
It looks like the config.dat method has been patched
H-BOOT version is 3.19
Did I lose my SIM unlock?
How can I get it back - downgrade? Going to GPE ROM? Am I screwed?
Why does my phone work with Rogers and not AT&T as it was originally an AT&T phone?
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