Partition info can be found in "/dev/block/...". But it is not readable, most of devices have readable info in "/dev/block/platform/msm_sdcc.1/by-name".
Backup:
dd if=/dev/block/platform/msm_sdcc.1/by-name/recovery of=/sdcard/Backup/recovery-backup.img
Restore:
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/recovery
dd if=/sdcard/Backup/recovery-backup.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery
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