I have a
Nexus S (on android 4, not rooted) device who's not able to boot. It opens and get stucks to the X screen. I can only access the recovery mode.
I tried to backup data via ADB, but the phone haven't activate USB debugging so I can't connect ADB backup (and it won't show in
adb devices). I can only get signal via USB when I go in "update via ADB" option, then the device show, but only the
sideload connection is activated.
How can I backup the data on the phone? Or how could I activate the USB debugging mode while in recovery?