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rfc6919

Contributor

Registered: 2022-01-25

Posts: 3

[SOLVED] only intermittent success connecting to computer

Hey! I just got a new Proxmark 3 RDV4.01 that I suspect is faulty - it usually fails to be detected when I plug it in to a host.

It works fine sometimes, but often (9 times out of 10? something like that) it's not detected by the computer I plug it into. I've tried with several different cables on a couple of different computers, and jiggling the cables when it's working doesn't seem to cause any problems, so I'm reasonably confident it's not a cable or port issue. When it's fails to enumerate on a linux box, dmesg shows error output like this:

[297840.107950] usb 3-1.3: new full-speed USB device number 21 using xhci-hcd
[297840.191986] usb 3-1.3: device descriptor read/64, error -32
[297840.384040] usb 3-1.3: device descriptor read/64, error -32
[297840.575884] usb 3-1.3: new full-speed USB device number 22 using xhci-hcd
[297840.659912] usb 3-1.3: device descriptor read/64, error -32
[297840.851865] usb 3-1.3: device descriptor read/64, error -32
[297840.964128] usb 3-1-port3: attempt power cycle
[297841.571727] usb 3-1.3: new full-speed USB device number 23 using xhci-hcd
[297841.578784] usb 3-1.3: Device not responding to setup address.
[297841.791802] usb 3-1.3: Device not responding to setup address.
[297842.003670] usb 3-1.3: device not accepting address 23, error -71
[297842.087667] usb 3-1.3: new full-speed USB device number 24 using xhci-hcd
[297842.094716] usb 3-1.3: Device not responding to setup address.
[297842.307755] usb 3-1.3: Device not responding to setup address.
[297842.519595] usb 3-1.3: device not accepting address 24, error -71
[297842.526152] usb 3-1-port3: unable to enumerate USB device

I see this behaviour having flashed current releases of both the mainline and iceman firmware.

Any troubleshooting suggestions? I wouldn’t expect this usually-failed but intermittently working behaviour from a bad flash, particularly after reflashing several times. Anything else I could try to see if I can get it working reliably?

Last edited by rfc6919 (2022-01-26 07:53:55)

rfc6919

Contributor

Registered: 2022-01-25

Posts: 3

Re: [SOLVED] only intermittent success connecting to computer

looks like it was some combination of flakiness on USB3 ports, and insufficient power due to skinny cables, unfortunately both causes giving the same symptom. seems to be working fine with a short fat cable on a USB2 port.