I received the SMB-SMA adapters and 2 mm Dupont cables this evening. I hooked up the first module to a USB-TTL serial adapter, set for 3.3 V. At the moment, I'm powering the active antenna separately from the same 3.3 V. Later, I may short the jumper on the board, depending on what antenna I eventually use.
Here in my living room (first floor), it got a 3D fix and was tracking nine satellites in less than a minute. The M8T seems more sensitive than the M6T that I have.
The configuration looks like the defaults for an M8T. GPS, GLO BDS & QZSS were enabled. I disabled all but GPS. It's already set to Stationary, which I believe is the default for a timing module.
The PPS works, but there is no LED on the board. The PPS is changeable, as it should be.
Edit: the firmware is 3.01, protocol 22.00, TIM 1.01 running from flash. The ROM has firmware 2.01.
As you can see, the antenna I'm using for testing is nothing special, just a patch antenna sitting on a mesh splatter screen, on the seat of my ebike.