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It's a bit weird for me to read all these negative reviews, though having read them, they are certainly justified given those users' experiences.
I bought my KC60 here in May 2016, and it arrived that August. Three and a half years later, it's still chugging along, and outside of some time on a 0.01 Z70, it's been my daily driver the entire time. In fact, I'm typing this very post on it.
The controller hasn't failed. Backlight still works fully. All I've done is occasional cleanings, keycap swaps, and the only things I've replaced on it are the plastic Costar stabilizer bits (the plate mounts and the keycap inserts).
I reflashed it with QMK in May of 2018, which I'm glad I had the foresight to do because the web page that was given for programming it seems to have either moved or died permanently.
I'd probably buy another PCB if I could, but Poker-type PCBs are so prevalent that it'd be fairly pointless to try to get this exact PCB.
I just found mine in a box and was hoping to clean it up and possibly upgrade the switches and stabilizers. Am I stuck with the Costar stabs, or is there another type I can use with this plate? Thanks in advance.
If yours is like mine, the included plate will only support Costar plate-mounted stabs. The PCB supports PCB-mount for both switches and stabs, so you could rebuild it without the plate and use Cherry-type stabilizers and PCB-mounted switches.
I guess it's a moot point now. I just tried to re-flash it with the QMK Toolbox and no dice. Windows alternately can't identify it or I can sometimes get some numbers and letters out of the keyboard while the lower three rows of keys are completely dead. So for whatever reason I can't seem to reflash it because the toolkit doesn't see the board. I'm stumped.
You should be able to get it in bootloader mode using the button on the bottom side of the PCB, and I'm fairly sure that works even if Windows doesn't detect the board attempting to operate as a keyboard. Some other comments in here say reflashing the board fixes the dead key issue.
QMK Toolbox should give you a message that says something like "*** DFU device connected: Atmel Corp. ATmega32U4 (03EB:2FF4:0000)" when it sees the bootloader. If you try to flash and you get a "No Device present" error, you probably need to install the bootloader drivers:
Otherwise, it should go off without a hitch.
I had the non-detection issue with another (non-QMK) keyboard recently, and a reflash fixed my issue.
I'm afraid my board is dead somehow or I've got a bad USB socket on the pcb. I get a connection chime and the standard USB device descriptor unavailable, but no bootloader tool (QMK/TMK/Zadig) sees the board for some reason. Thanks so much for your help. I'm going to keep trying, but I might be out of luck. The board at least used to output a few keypresses on a small group of letters like other people reported, but now I can't even get it to do that.
Since this is the most active thread I can find anywhere online regarding the KC60 — what tool are you using to program the layers/functions in 2020? I just pulled mine out of a box from storage, and I can't remember what any of my programmed keys are. Haha. The link on KeyChatter doesn't seem to be working anymore. Or maybe I am doing something wrong. It has been a few years since I've used this board, let alone programmed it.
EDIT: I should also mention, I have no problems with the keyboard. Still types just fine (currently typing with it), so I'm with you on the negative reviews.
Thanks for the reply! I looked through my old desktop and found Easy AVR. Realized that's what I used in the past and it all came back to me. Everything works great again.