For a t20 where can I download the " Nividia USB Boot-Recovery driver for mobile devices"? the one from the manufacturer has an unsigned driver

The T20 is installed on a Carrier Iris board V1.1B. The device shows up as APX and has a driver issue. When I try to update the driver that I downloaded from your website, Windows comes up with the following message:
" The third party INF does not contain digital signature information"

Dear @BigBob
The drivers are signed, but I just found that the certificate has expired in Nov 2019.
I will get back to you when we have an updated installation package ready.

Dear @BigBob

We uploaded a newly signed version of the NvFlash tools to the same link as before:

Regards, Andy