Upgrade firmware of SanDisk SanDisk Ultra II 960GB on a Mac, how?

SanDisk support seems frustrating.

But I use my SanDisk SSD in my MacBookPro now about 1500 hours without problems.

I hat TRIM turned on too.

I use DriveDX, to monitor the S.M.A.R.T. status too.

https://binaryfruit.com/drivedx