crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

First reinstall the latest version of Android File Transfer,

download here and follow the directions.

That failing, replace the cable and examine the ports for debris.

https://www.android.com/filetransfer/

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open