Use a 8GB or less USB stick formatted. Can use the Dongle for this, but will make the LCD update longer, in 3 stages. 

Inverter
In the folder D706-A706 there are 2 files, ARMStore.bin & DSPStore.bin. Copy these to your USB stick
Remove the Dongle, if not already done so, and insert the USB stick
The Inverter will recognise the update and begin flashing green and red for 2-3 mins
Once you get a long beep, wait 30 seconds and remove the USB Stick
Update complete (If Battery not up to date, battery will now be in error, please continue the updates)
Confirm onscreen the version reads 705

Battery
In the Folder BMS_4008 there is a file ARMStore.bin & BCONFIG.txt, copy these to a USB stick.
Ensure the files from the Inverter step are removed before continuing.
Insert the USB stick into the Inverter
The File will be loaded and transferred to the battery, if more than one battery you will see them update sequentially
Update Complete

LCD Screen
In the Folder 75 LCD, copy all the 5 files to your USB stick
  Note if using a Dongle do in 3 stages, (LCD13, LCD14, LCD22), then LCD15, then LCD26. Reboot between each stage and wait to complete
  before doing the next. The screen will look odd till all 3 parts are done. 

Insert the USB into the Inverter, it will flash red/green while updating.
The screen update can take approx. 45 Mins to complete.
Update is complete once the Inverter returns to normal operation.

