Firmware corrupt 5.1.3.3G

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2016-07-21 00:10

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Hi there.
Last week i got my M3 Note. A real good device for a few bucks! Great performance.
BUT... there are problems using whatsapp and my network connection get often terminated. So read in a thread here, that version 5.1.3.3G will fix the network issue. I downloaded the firmware but it dont work. Every time i got the message "firmware corrupt". In file explorer an in file recovery. All the time error.
I tried the tutorial for changing chinese to global, but dont works. Still corrupt.
MD5 is checked.
I have version 5.1.3.2G installed. Please help.
Thanks