I purchased a Tmobile Samsung Galaxy Tab 7 on ebay. It has CyanogenMod version 10.1-20130827 istalled with phone capabilities. I did insert my sim card and had the message IMEI is invalid. Am unable to get any network. Can anyone please help me as to how to go around around this IMEI error message. Thank you
restock. Your EFS partition is likely corrupted.
In theory, flashing stock ROM should get your EFS back.
If so, then backup the /EFS content, and you can upgrade to CM10.1 again.
If the IMEI is still bad at that point, you can manually restore the EFS using your backup copy.
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