Userdata — Oppo A37m

Download a large dummy file (e.g., a 1GB video) and copy it to the internal storage, then delete it. Repeat 2-3 times. This overwrites residual data blocks.

Use this format to help users save their files before a reset or firmware flash. Local Backup (Offline): Additional Settings Backup and reset Local Backup New Backup and choose your data. Crucial Step: Move the backup folder from oppo a37m userdata

The OPPO A37M runs Android 5.1, which supports basic Google backup. Download a large dummy file (e