• Google Galaxy Nexus (GSM) entry page: http://wiki.cyanogenmod.org/w/Maguro_Info
• Using this main manual
• To enable Enable USB Debugging, we first need Developer Options
• Get „SDK Tools Only“ at http://developer.android.com/sdk/index.html
• Download cm-10.2.1-maguro.zip from http://download.cyanogenmod.org/?device=maguro&type=stable

Original OS: Android 4.3

# ./fastboot devices
0A3C2D8E0D009009	fastboot

     0d4512fcb1089fec2aded8037962c098  recovery-clockwork-6.0.4.7-maguro.img
md5: 0d4512fcb1089fec2aded8037962c098

Direct Download: cm-10.2.1-maguro.zip
md5sum: c4eda6a6d210b5b30bdf6c3d9645e9d1
        c4eda6a6d210b5b30bdf6c3d9645e9d1  cm-10.2.1-maguro.zip

Reboot the device into recovery: Volume Up or Volume Down to select Recovery mode, then press Power to confirm your selection.
=> Lead into Recovery recovery-clockwork-6.0.4.7-maguro: ok

"error: insufficient permissions for device" => "adb kill-server" and then run "adb devices"
Still error => "Reboot system now" from Recovery: Confirm all questions with default "no"

adb reboot bootloader

recovery: backup and restore

md5: 1f51b5cc6370c1f45dc951109b6ce6ed
     1f51b5cc6370c1f45dc951109b6ce6ed  gapps-jb-20130813-signed.zip

• 1st enable USB-debugging on the device!
• http://wiki.cyanogenmod.org/w/Doc:_adb_intro
• http://wiki.cyanogenmod.org/w/Adb_--help

adb devices
adb shell
  cd /storage/emulated/legacy/DCIM/Camera
adb pull /storage/emulated/legacy/DCIM/Camera

http://wiki.cyanogenmod.org/w/Doc:_sshd