2 Internet losses in less than 24 hours

Here’s the T-mobile Home Internet Gateway firmware web page:

https://www.t-mobile.com/support/devices/firmware-updates--t-mobile-home-internet

It says the latest is 1.00.16, but also states the shipping version is 1.00.14. So it's odd that you only have 1.00.12.

You should receive the update in the next few days, I imagine, assuming the gateway stays connected overnight (between 1-3am). If not, or if you want it done sooner, you'll have to call tech support and request it.