Huawei EC315 New Firmware not able to set on RUIM mode

Hello

I have Huawei EC315 with new version when write RUIM mode and replug it again goes back to NV mode, Not even able to downgrade to old version

I tired repair NVM but it gets failed & if try fix NV only option device gets stucked in download mode and then not able to done anything with NCK

Module Ver. : 3.1
Com Port : COM19 : FC - Application Interface (COM19)
Baud Rate : 921600
Device : Huawei EC315
Operation : Read Info
Opening Port...
Reading Information...
Compile : Aug 6 2015 14:31:38
Release : Mar 05 2014 02:00:00
Hw Ver. : SCAUTHZ3
ESN : 80921FXX
MEID : A0000049AXXXXX
Hw. Type : EC315-1CE1EC315M Ver.A
Firmware : 11.107.21.00.172
Dashboard : 11.107.21.00.172
Calculating Flash Code...
Flash Code : 34946978
Reading Lock Status...
Lock Status : Unlocked
RUIM Mode : NV Only
Operation finished.
Port Closed.
Elapsed Time: 00:01

any soultion please ?

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Huawei EC315 New Firmware not able to set on RUIM mode