modem unlock error

Port : COM40 : FC - PC UI Interface (COM40)
Baud Rate : 921600
Device : Huawei E8372H-608
Operation : Unlock
Opening Port... OK
Reading Information... OK
Manufacturer : huawei
Model : E8372
Revision : 21.316.01.04.274
IMEI : ??????????????????
Build : Mar 17 2017, 09:34:28
Software : 21.316.01.04.274
Dashbaord : WEBUI_17.100.15.10.274_RE5
Hardware : CL1E8372HM Ver.A
Flash Code : 56198394
Lock Status : Locked (10 Attempts Left)
Resetting Network Lock... Failed
Flash Unlock Firmware from Support First!
Port Closed.
Operation Failed.
Elapsed Time: 00:02
[Module Ver. 5.5]
the message (Flash Unlock Firmware from Support First!) i flashed firmware from support first then tried and logs here unlock error
also there is only one firmware on support which i tried..
please unlock solution for this device needed