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I rooted my samsung sg-G900H. When I connect it to my PC and look for a COM port, there is no COM port, so I can't connect to it with Qualcomm eXtensible Diagnostic Manager (QXDM). How can I enable serial port access to the modem and connect to it with QXDM?

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This thread on the XDA forum describes it.

Here is a short code to get the phone to show debug mode: *#197328640#

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Dial _ *#0808# and select DM+Modem+ADB

You would also need drivers then only it would work

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