VKB-SIM

That did it, I can now flash firmware successfully.
Thanks for the help Ron61!

Here's the generated op1 file, archived in a zip.

I'm not sure I understand these steps correctly.
Do I just plug in the black box USB, wait 3 seconds, then hold down the SYS button for a while? I tried that and the SYS LED did not change, so I'm not sure it did anything... but I still couldn't flash firmware afterwards

I downloaded the v2_12_A package (I assume that's the latest, based on the date?) and repeated the process and got same result:

As instructed I disconnected the black box from the base, then held down the SYS button while connecting the black box USB to my PC. The Zbootloader2 window showed "Found Boot Device: VKB Boot NJoy32 platform". I unchecked "auto" then tried to load the Trudder firmware, and got t...

Sure, here are screenshots of the software and the folder:

I'm still unable to flash any firmware to the Gunfighter - any potential solutions?

Before flashing it says "Boot device: detected - OK" at the top and "Found Boot Device : VKB Boot NJoy32 platform" in the list.
Here's a screenshot:

My Gunfighter currently has the firmware loaded for the MCGU-twist grip. I'm trying to flash a firmware for a different grip (KG12) but the Bootloader throws a "Device signature not correct - flash fail" error. I'm using he latest downloads from the website: firmware pack 2_12_2 (Mk2 since...