I just checked our GT680W all black with white lettering after about four months of ignoring it.
If I recall correctly, we are using firmware version 2.7. I use a transcend class 10 32 gb memory card.
The GT680W and GPS antenna is mounted out of drivers sight behind the review mirror.
I have it hardwired with an "add a fuse" connected to a slot on the fuse box that energizes with the ignition using the provided plug and an aftermarket socket held together with a few wraps of electric tape. Surprisingly, the provided cable is sufficiently long to run from the fuse box in the center console, through the dash, up the side pillar and across to the rear view mirror.
I turned off the greeting, set screen saver (?) to 3 minutes and record at 1080 & 30 fps. It fires up with the car, turns of the screen a bit later and shuts down when I park.
The memory card stored the most recent trip without flaw and the files loaded easily with complete GPS info on more than one program. The oldest file was commensurate with the memory capacity indicating the "rollover" is working correctly.
The difficulties noted in my earlier threads have more to do with proceeding with a hard wire install without working out functionality while loose. The biggest frustration was not realizing the GPS antenna must have the correct side facing satellites. I could complain about the included instructions, but I rather suggest patiently pursuing all menus and configurations by trial and error until your expectations are satisfied.