EM7455 Unable to update firmware Primary error code: 51

[rljones]

I installed a new EM7455 into the USB3.0 To NGFF M.2 Key B Adapter Enclosure With SIM Card Slot. I installed the latest Windows drivers without issues. Seems like everything installed. I used the Huawei Modem Terminal and tested the connection. Then when I ran the firmware I received some errors. Any one have a solution to get it to install the firmware?

FDT version: 1.0.1806.0
Awaiting adapter ...
Setting images preference ...
Enabling selective suspend ...
Firmware download failed.
Primary error code: 51 - Failed to switch device to BOOT&HOLD mode.
Secondary error code: 201 - Failed to switch device to QDL mode.
Device error code: 0x0 - Unknown device error code.

Preexisting images information:
Current:
Firmware:
ImageId:
BuildId:
Configuration:
ImageId:
BuildId:
Final images information:
Current:
Firmware:
ImageId:
BuildId:
Configuration:
ImageId:
BuildId:

OEM PRI:

IMEI:

Total time elapsed: 22437 ms.


Images downloaded:


Press Enter to continue ...
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I just reset the modem to default settings and now it gives me this. Any suggestions. Not sure what to do.

FDT version: 1.0.1806.0
Firmware download failed.
Primary error code: 75 - Failed in initializing modem object.
Secondary error code: 0 - Not applicable.
Device error code: 0x0 - Unknown device error code.

Preexisting images information:
Current:
Firmware:
ImageId:
BuildId:
Configuration:
ImageId:
BuildId:
Final images information:
Current:
Firmware:
ImageId:
BuildId:
Configuration:
ImageId:
BuildId:

OEM PRI:

IMEI:

Total time elapsed: 10125 ms.
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[JimHelms]

I would plug the USB adapter with the modem, back behind the PC, and reinstall the latest Sierra software drivers for Windows.

Then, unplug and plug back in the USB/Modem. Then use Huawei Terminal to see that all three COM ports are showing. If so, close out the Terminal and try flashing the firmware again.