[Q] Adb and Adb shell help - Xperia Z2 Q&A, Help & Troubleshooting

Hi,
When I start up adb and use the command "Adb devices" my device show. I want to use adb shell, so I type "Adb shell" ofc. Then, when I try "Adb devices", my device does not show :/ Anyone have a solution?

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First thing first, make sure you have USB debugging on.
To do this, go into About Phone, tap the build number 7 times (this should give you a toast notification that you are now a developer).
Go back, now go into the developer options what has come up above about phone.
Tick the USB Debugging box, and then connect your phone and try to connect with adb shell.
If this doesn't work, revoke USB debugging authorisations, then try adb shell again.

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gamer649 said:
First thing first, make sure you have USB debugging on.
To do this, go into About Phone, tap the build number 7 times (this should give you a toast notification that you are now a developer).
Go back, now go into the developer options what has come up above about phone.
Tick the USB Debugging box, and then connect your phone and try to connect with adb shell.
If this doesn't work, revoke USB debugging authorisations, then try adb shell again.
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That didn't work :/ Any other suggestions?

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Have you installed the ADB drivers and drivers for the board set the Z2 uses?

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gamer649 said:
Have you installed the ADB drivers and drivers for the board set the Z2 uses?
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At least flashtool says I have ADB drivers installed?

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Skanin said:
At least flashtool says I have ADB drivers installed?
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I'm not sure what to suggest then. @Envious_Data any suggestions?

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gamer649 said:
I'm not sure what to suggest then. @Envious_Data any suggestions?
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A screenshot of what happens, if that helps

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you're already connected in adb mode, as your pic shows, so why would you need to use adb devices again ?
what are you trying to do ? you've successfully connected to your device in adb mode and used the su command, so what do you want to do ?

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ticktock666 said:
you're already connected in adb mode, as your pic shows, so why would you need to use adb devices again ?
what are you trying to do ? you've successfully connected to your device in adb mode and used the su command, so what do you want to do ?
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Yeh, I know.. But I want to use the command "adb remount rw /system". If use it without "abd shell" I get a permission denied error, and in "adb shell" I get error: device not found.. (see picture)

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Skanin said:
Yeh, I know.. But I want to use the command "adb remount rw /system". If use it without "abd shell" I get a permission denied error, and in "adb shell" I get error: device not found.. (see picture)
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Note, don't use any quotes for the below commands.
1) Connect device to computer.
2) Type "adb shell" in cmd, then press enter.
3) Type "su", then press enter.
4) Type "mount -o rw,remount /system", then press enter.
Congratulations, it is now remounted. ADB devices will not work on the device, as the device cannot connect to itself to itself via USB.

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what gamer said, you were simply using the wrong command for mounting