As of last week I've been getting the ER05 invalid sim error on my LG G3. It comes and goes but tries to restart my phone and DOES about 90% of the time. Ive had the same sim forever and am not sure how to fix it... The phone is telling me an upgraded sim is required. That happens 3 seconds before it attempts a restart. I'll say this started when my CM Security updated. Anyone have any ideas how to fix this without a large rock or boiling magma bath?

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      • snn_555

        Re: ER05 Error

        Remove CM security first and foremost.  If that does not rectify, you probably need a new SIM from T-Mobile.  Visit a store or call customer care or contact T-Force on social media.  There may or may not be a charge for a new SIM.  Do not reinstall CM.  Cheap Chinese adware that does more harm than good.  You can do most everything it does from your phone's settings menu.

        1 of 1 people found this helpful
        • tmo_marissa

          Re: ER05 Error

          Hey spidermonkey11664!  I just wanted to check in and see if you'd updated your SIM card - how is everything going?  Boiling hot magma avoided?


          - Marissa