Recover data from bootlooped phone I have a Samsung Galaxy S Plus (GT-I9003) that is stuck in a boot loop. It is running the stock Samsung firmware (Android 2.3.5). I want to recover the data (specifically of the Memo application) from the device. I can boot into recovery mode and then connect via adb shell, but I'm not allowed to read /data:

$ ls -l /
(...)
drwxrwx--x root     root              1970-01-01 00:00 data
$ id
uid=2000(shell) gid=2000(shell) groups=1003(graphics),1004(input),1007(log),1009(mount),1011(adb),1015(sdcard_rw),3001(net_bt_admin),3002(net_bt),3003(inet)
$ su
su: permission denied


How can I backup /data from this phone?
I was able to copy the data by first rooting the phone. After routing, I can boot up the phone in recovery mode, connect via adb shell, and use cat /dev/mmcblk0 / cat /dev/block/stl10 to get the interesting data from the phone.