New answers tagged usb-connection-mode
You can do it the easy way: Download ROM Toolbox. Then choose reboot to download mode.. :) good luck
Generally, whenever you connect the USB the phone is in USB charging mode by default. To change to any other mode (file transfer mode in your case), go to the notification pane where a notification would tell you that usb is connected and charging. Tap on it and select the MTP or file transfer mode.
Try removing your SIM card(s). I had a similar issue and it worked fine again after restarting without them. I have checked now and it does work/transfer-files again, also with the SIMs in too.
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