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error: failed to set cfg item 3704: Pipe error

Hi, thanks for the great utility, I use it to keep straight which devboard has which firmware by setting it's Serials. But with some boards I recently developed I'm met with this. Any help or suggestion as to the cause would be appreciated.

sparklemotion 13:26 [s] $ sudo ./cp210x-cfg -S "test"
ID 10c4:ea60 @ bus 007, dev 007: CP2102N USB to UART Bridge Controller
error: failed to set cfg item 3704: Pipe error
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
Name: CP2102N USB to UART Bridge Controller
Serial: c4fada6439c5e711b8928568f41b81de

"error: failed to read cfg item 3704: Other error" with empty serial number

I have a cp2102 USB-serial dongle with no serial number set, and cp210x-cfg reports an error:

# ./cp210x-cfg
ID 10c4:ea60 @ bus 000, dev 003: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
error: failed to read cfg item 3704: Other error

I can set a serial number:

# ./cp210x-cfg -S $(pwgen -s 10)
ID 10c4:ea60 @ bus 000, dev 003: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
Serial: 8OoOE8NmD5

And I can tell cp210x-cfg to set the serial number back to an empty string, which returns the error again:

# ./cp210x-cfg -S ""
ID 10c4:ea60 @ bus 000, dev 003: CP2102 USB to UART Bridge Controller
Model: CP2102
Vendor ID: 10c4
Product ID: ea60
Name: CP2102 USB to UART Bridge Controller
error: failed to read cfg item 3704: Other error

But the Python cp210x-program does report the empty serial number, without error:

# python2 ./cp210x-program
[usb device]
product_string = CP2102 USB to UART Bridge Controller
serial_number = 
...

So it looks like everything functions correctly, except for emitting the error message.

error: failed to read cfg item 3703: Input/Output Error

I sometimes get errors when reading CP2102 devices. I get the same errors when trying to write the NAME field. I haven't tried any other changes.

$ sudo cp210x-cfg -m 10c4:ea60
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
error: failed to read cfg item 3703: Input/Output Error
Serial: 55f11b71d8cdbac69d77ac99e08c527b
$ sudo cp210x-cfg -m 10c4:ea60
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
Name: CP2102N USB to UART Bridge Controller
Serial: 55f11b71d8cdbac69d77ac99e08c527b
$ sudo cp210x-cfg -m 10c4:ea60 -N FOO10R200
ID 10c4:ea60 @ bus 001, dev 014: CP2102N USB to UART Bridge Controller
error: failed to set cfg item 3703: Pipe error
Model: CP210Q
Vendor ID: 10c4
Product ID: ea60
error: failed to read cfg item 3703: Input/Output Error
Serial: 55f11b71d8cdbac69d77ac99e08c527b

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