Oppo devices use specific encryption standards. Flashing a userdata image from a different phone (even the same model) often causes an "Encryption unsuccessful" error. In most cases, it is safer to simply perform a "Format All" or a Factory Reset via Recovery than to flash a raw userdata image.
Since Android 5.1 Lollipop, the OPPO A37M uses Full Disk Encryption (FDE) by default. Your lock screen credentials are stored inside the /data/system/locksettings.db file. oppo a37m userdata
| Parameter | Value | |-----------|-------| | Block size | 4096 bytes | | Inode size | 256 bytes | | Reserved blocks | 5% (typically ~125 MB) | | Journal | Yes (internal, 32 MB typical) | | Features enabled | has_journal , ext_attr , resize_inode , filetype , extents , flex_bg , metadata_csum (later builds) | Oppo devices use specific encryption standards
Oppo devices use specific encryption standards. Flashing a userdata image from a different phone (even the same model) often causes an "Encryption unsuccessful" error. In most cases, it is safer to simply perform a "Format All" or a Factory Reset via Recovery than to flash a raw userdata image.
Since Android 5.1 Lollipop, the OPPO A37M uses Full Disk Encryption (FDE) by default. Your lock screen credentials are stored inside the /data/system/locksettings.db file.
| Parameter | Value | |-----------|-------| | Block size | 4096 bytes | | Inode size | 256 bytes | | Reserved blocks | 5% (typically ~125 MB) | | Journal | Yes (internal, 32 MB typical) | | Features enabled | has_journal , ext_attr , resize_inode , filetype , extents , flex_bg , metadata_csum (later builds) |