This is the problem, please help, what can I do , My phone is on video
My Phone Video
Try this Galaxy S4 GT-I9500 Repair IMEI "NULL/NULL" - GSM-Forum.
I haven't had this problem but you aren't alone and this has helped some people. Good luck.
I hope someone can help theme, thank you
I tried to. Did you not read my post immediately above yours?
My phone is i9505, and it does not work, it is only for i9500 version,
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