Oppo F1s Format Flash Error

Var OPPO-F1s (F1s LTE DS) at USB Auto Select [MTK] {Format Flash}
BR USB Com: Vid_0e8d&Pid_0003 (BROM)
DA Agent : DA_OPPO_F3_2.bin
BR ComPort: COM12
BR Asic Id: MT0326 [0000] Alias: MT6755
BR Asic Sw: 8A00 CB00 0001 0000
BR Fuse Id: 00000442
BR ME_ID : DC714BE84FB1762F6B0549F881FDFF8A
BR Secured: 01 [SBC]
DA AgentId: SAE2C0245350269729
DA Version: MTK_AllInOne_DA_v3.3001.00.00.
DA ProtVer: 4
PR DlagVer: 1.0
PR BootMod: brom
EMI PreLdr: preloader_oppo6750_15131.bin
EMI TagVer: 22
DA Asic Id: MT6750 [8A00 CB00 0001 0000 0000]
eMMC BOOT1: 0x0000000000400000 [4.194.304] 4 MB
eMMC BOOT2: 0x0000000000400000 [4.194.304] 4 MB
eMMC RPMB : 0x0000000000400000 [4.194.304] 4 MB
eMMC USER : 0x0000000747C00000 [31.268.536.320] 29.12 GB
eMMC CID : 90014A484247346132A43537ED9F63E9 [HBG4a2]
ERAM Size : 0x0000000080000000 [2.147.483.648] 2 GB
IRAM Size : 0x0000000000040000 [262.144] 256 KB
UNICAL ID : 27FB503097B55E8C93D01689E567921B
DA USB Com: Vid_0e8d&Pid_2001 (DA HighSpeed)
DA USBconf: high-speed
PGPT Found: 39 Partition Entries
SGPT Found: 39 Partition Entries
Erasing: LinST: 0x00E1000000 Size: 0x0665BFBE00 userdata
DL_ERASE Error: -6, -1
ERASE Failed, Error: -4, 000000
Format Flash Failed: -4
DA Shutdown Done, Disconnect Cable

Var OPPO-F1s (F1s LTE DS) at USB Auto Select [MTK] {Format Flash}
BR USB Com: Vid_0e8d&Pid_0003 (BROM)
DA Agent : DA_OPPO_F3_2.bin
BR ComPort: COM12
BR Asic Id: MT0326 [0000] Alias: MT6755
BR Asic Sw: 8A00 CB00 0001 0000
BR Fuse Id: 00000442
BR ME_ID : DC714BE84FB1762F6B0549F881FDFF8A
BR Secured: 01 [SBC]
DA AgentId: SAE2C0245350269729
DA Version: MTK_AllInOne_DA_v3.3001.00.00.
DA ProtVer: 4
PR DlagVer: 1.0
PR BootMod: brom
EMI PreLdr: preloader_oppo6750_15131.bin
EMI TagVer: 22
DA Asic Id: MT6750 [8A00 CB00 0001 0000 0000]
eMMC BOOT1: 0x0000000000400000 [4.194.304] 4 MB
eMMC BOOT2: 0x0000000000400000 [4.194.304] 4 MB
eMMC RPMB : 0x0000000000400000 [4.194.304] 4 MB
eMMC USER : 0x0000000747C00000 [31.268.536.320] 29.12 GB
eMMC CID : 90014A484247346132A43537ED9F63E9 [HBG4a2]
ERAM Size : 0x0000000080000000 [2.147.483.648] 2 GB
IRAM Size : 0x0000000000040000 [262.144] 256 KB
UNICAL ID : 27FB503097B55E8C93D01689E567921B
DA USB Com: Vid_0e8d&Pid_2001 (DA HighSpeed)
DA USBconf: high-speed
PGPT Found: 39 Partition Entries
SGPT Found: 39 Partition Entries
Erasing: LinST: 0x00E1000000 Size: 0x0665BFBE00 userdata
DL_ERASE Error: -6, -1
ERASE Failed, Error: -4, 000000
Format Flash Failed: -4
DA Shutdown Done, Disconnect Cable