Oppo A5s (CPH 1909) formatting user data successfully done by Hydra Tool 1. Run MTK Module of Hydra Tool
2. Choose Brand and Model
3. Go to Service-->Tools-->Ultra Power Option
4. Choose "Erase User Data" from drop down menu of Method / Option
5. Execute and insert the USB Data Cable
6. Wait until the operation is completed.
Screen Short: 
Logs: Quote:
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Searching for MTK Device...Found
Port Identification :Flashmode BROM
FriendlyName :MediaTek USB Port_V1632 (COM29)
SymbolicName :\??\USB#VID_0E8D&PID_0003#6&dc60f3b&0&1#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Driver Ver :01/22/2015,3.0.1504.0
Reading Device UniqueID, RAM and Flash Chip Info...
UNIQUE ID : BD6570B7A558B7346D5252AC1FD7B7C3
ERAM Size : 0x000000000003A000 -232 KB
IRAM Size : 0x0000000100000000 -4 GB
eMMC BOOT1 : 0x0000000000400000 -4 MB
eMMC BOOT2 : 0x0000000000400000 -4 MB
eMMC RPMB : 0x0000000000400000 -4 MB
eMMC USER : 0x0000000E8F800000 -58.242 GB
eMMC CID : 1501005248363441420591069A7CA60F - RH64AB
Reading GPT-EMMC [0x00008000] 130 Items
Reading System Info
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Operation : Erase Userdata
Processing...
Erasing FRP Partition...
Formatting Userdata... Ok
Elapsed Time : 00:00:15
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BR
Dipendra Pathak