blu frp how to remove?

Card found : S/N : 69F34682 , v0137
Chinese Miracle II [MTK module] v 1.58

Operation : Format FileSystem [ v1.58 ]

1. Power Off Phone , Remove battery , Insert back
2. Insert USB cable. In some cases require hold BootKey

Wait for phone...
Phone found! [ 19 ]
Sync...
Inital Boot Ok!
BB_CPU_PID : 6580
BB_CPU_NME : [MediaTek] MT6580_S00
BB_CPU_EXT : 0xCA00 , 0x8A00 , 0x0000
Processing BROM stage
Settings for BROM configured!
SecCfgVal : 0x01000000
BromVer : 0x00FF
BLVersion : 0x0001
PreLoader : Active [ Boot with PL ]
BootLdrSS : SIGNED with SPRELOADER
Processing DA stage
DA Select done, will use MTK_AllInOne_DA_v5.1624.16.07
Sending and initialize DA ...

[DA_ERROR] : SECURITYBOOT_BOOT_NOT_ACCEPTED
Boot Error!

Operation Failed
Elapsed: 00:00:18
Reconnect Power/Cable!