Dell HBA330 issues (power-on or device reset occurred)

Started using TrueNAS recently after having QNAP units for years. So far its been wokring really well.

Had some issues with slow SMB via VPN, but got to the bottom of that (H330 was not running HBA firmware)

My next issue is where I cannot find a solution. I am constantly getting the following on the system:
power-on or device reset occurred

From my understanding this is a firmware issue that Broadcom and iX worked on and resolved in FW 16.00.12.00 however, I cannot for the life of me get it installed on the Dell card (I have 2 identical cards and neither installs)

I used Dells official firmware to upgrade via Windows Server yesterday
https://www.dell.com/support/home/en-uk/drivers/driversdetails?driverid=nknvc

sas2flash -listall
Avago Technologies SAS3 Flash Utility
*Version 16.00.00.00 (2017.05.02) *
Copyright 2008-2017 Avago Technologies. All rights reserved.

Adapter Selected is a Avago SAS: SAS3008(C0)

Num Ctlr FW Ver NVDATA x86-BIOS PCI Addr
----------------------------------------------------------------------------

0 SAS3008(C0) 16.00.11.00 0e.01.00.39 08.37.02.00 00:01:00:00
1 SAS3008(C0) 16.00.11.00 0e.01.00.39 08.37.02.00 00:04:00:00

Finished Processing Commands Successfully.
Exiting SAS3Flash

Does anyone know how to flash the cards to the firmware that works as expected?