I am a new user. I purchased a Samsung Action 4S AT&T on KitKat 4.4.2 that was working just fine on T-Mobile where I am located in Germany until I tried to update to Lollipop 5.0 and T-Mobile firmware. I ended up with custom ROM with the IMEI now showing a NULL, still on AT&T and *#0011# showing a blank screen. I re-installed a stock version of AT&T firmware and an now back to the original Active login screen but still have a null IMEI. :confused:
Having attempted several apps to write the original IMEI to the phone, also using ODIN, have all resulted in failure. I contacted AT&T to get an unlock and received a code, cannot do anything with it since I can't go on line to a provider. Lot's of unwanted other stuff too.
Using many different forms of firmware to change, update, downgrade or whatever might work, always ends up with the note "signature not recognized" or some other term that stops the downloads. Most attempts I have used ODIM. I have an MAC computer and have tried to use Heimdall, but it is confusing to me and never finds my device anyway.
All I can say is "HELP".
Having attempted several apps to write the original IMEI to the phone, also using ODIN, have all resulted in failure. I contacted AT&T to get an unlock and received a code, cannot do anything with it since I can't go on line to a provider. Lot's of unwanted other stuff too.
Using many different forms of firmware to change, update, downgrade or whatever might work, always ends up with the note "signature not recognized" or some other term that stops the downloads. Most attempts I have used ODIM. I have an MAC computer and have tried to use Heimdall, but it is confusing to me and never finds my device anyway.
All I can say is "HELP".
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