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After Flashing new firmware onto AG Chrome Go-Tab 7 (Stock firmware/ROM Unrooted), below errors occur
-  IMEI Invalid
- Tab is running Android 4.2.2(Jelly Bean), previously ran 4.4.2 (Kit Kat)
 Please advise how to proceed fixing above mention problems.

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by Genius (34,235,140 points)
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Hi. This is very common. All you have to do is something like this:
by User (100 points)
via sp flash tool.flash the sec_ro file from stock rom or flash entire new stock rom

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