zte z820 fail to unlock

[chipscell25]

Using library Brom_DLL_v7.1733.4
Searching phone in normal mode;
[connect the phone powered off with volume up pressed to the usb cable]
Phone detected (MediaTek USB Port (COM20))
Preparing to start flash mode;
Preparing to open COM20
Connecting;
Downloading DA;
Initializing;
Rid: a7b9450b26608f88777b3fed6ece5732
Requesting baudrate change;
Done;
USB SPEED: USB_FULL_SPEED
Switching to DA_HIGHSPEED_VCOM;

Drivers location \usb_driver\Driver_Auto_Installer\SmartPhoneDriver \x86;
If the detection fails, install manually the port from the device manager using usbvcom.inf;

DA_HIGHSPEED_VCOM (@oem62.inf,%vcom_da%;MediaTek DA USB VCOM (Android))
TRYING TO OPEN COM14;
DEVICE INFO:
BB CHIP: MT6735M [CA00, 00, 335, 05]
HW_STORAGE_EMMC: 0x484A0190 0x65314738 0x1A270705 0x59B2096C [SIZE=0x1D2C00000]
IMEI1 [OTP 00FF]: 868485-02-513343-4
IMEI2 [OTP 00FF]: 000000-00-000000-0
PROVIDER: N/A
USRDATA INFO: 0xD6000000 SIZE: 0xF8480000



Searching data;
Checking server support license;
Bruteforcing ... relax ;-)
Bruteforcing more ... relax more ;-)
ERROR: BRUTEFORCE FAILED; WRONG SERIAL ENTERED MAYBE !?

Time needed - 00:47:48