The OPPO A37m is an entry-level Android smartphone (MediaTek-based) that uses a typical Android partition layout including a userdata partition. The userdata partition stores user-installed apps, app data, accounts, system settings, downloaded media, and other personal files. On devices like the A37m this partition is usually formatted as ext4 and mounted at /data in normal operation.
On the OPPO A37m (running Android 5.1 Lollipop with ColorOS), userdata refers to the partition or storage area that holds: oppo a37m userdata
When you download stock firmware (usually titled OPPO_A37M_EX_11_A.XX_XXXXXXXX), you will find several image files: OPPO A37m — userdata partition write-up Overview The