go to this page:
https://www.amazon.com/gp/help/custo...deId=201064850
Scroll down, copy the link to the current update, which gives you:
https://s3.amazonaws.com/G7G_Firmwar...le_5.6.1.1.bin
Now change the version number in that URL, which gives you:
https://s3.amazonaws.com/G7G_Firmwar...le_5.4.4.2.bin
Click the link you just created.