Please help with Nvidia Shield Tablet Updates

I found latest updates here: https://developer.nvidia.com/gameworksdownload#?search=SHIELD%20Tablet%20K1
But my NST has 5.3 and i know that next update is 5.4
Where i can download 5.3 and 5.4 (i want use fastboot)?

Hello,

Welcome to the NVIDIA Developer forums. Please post Shield questions in the GeForce forums. There are experts there to assist.

https://www.nvidia.com/en-us/geforce/forums/discover/