this diagram is about insert sim problem solution and also how to make
jumpers of sim problem in china etel m77a.in this diagram all links are
indicated with different colors so that can be identified easily check
all these links with electronics meter and then if any of them is broken
make these jumpers.you may have to change this small ic that is used in sim function in china mobiles.mostly all china mobile board use same links here is only the difference of brand name and also different of ic places in different boards.this diagram is made by gsm sri lanka.
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