Donnie Menig wrote:

I have the Tascam US-1641 firmware now... I'm pretty sure I did everything right, but I keep getting the "can't modify CPUCS: Broken pipe" or "unable to open for input." error.

You didn't tell what you're doing with the firmware, or how you're doing it, but I guess you are trying to download it.

"Broken pipe" means error code EPIPE, which means, according to linux/Documentation/usb/error-codes.txt, "endpoint is stalled", which means that the device did not like what you did to it.

The "CPUCS" indicates that you're trying to use the EZ-USB download protocol; however, the firmware file is too big for that, i.e., your device is based on some other chipset.

Best regards, Clemens