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Locked Device

To start extracting data from an Android device it has to be unlocked. If it's locked you can:

Check if the device has debugging via USB activated.
Check for a possible smudge attack
Try with Brute-force

Data Adquisition

Create an android backup using adb and extract it using Android Backup Extractor: java -jar abe.jar unpack file.backup file.tar

If root access or physical connection to JTAG interface

cat /proc/partitions (search the path to the flash memory, generally the first entry is mmcblk0 and corresponds to the whole flash memory).
df /data (Discover the block size of the system).
dd if=/dev/block/mmcblk0 of=/sdcard/blk0.img bs=4096 (execute it with the information gathered from the block size).

Memory

Use Linux Memory Extractor (LiME) to extract the RAM information. It's a kernel extension that should be loaded via adb.