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Pro Trinkets not Bootloading Properly
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Please be positive and constructive with your questions and comments.

Pro Trinkets not Bootloading Properly

by kseto on Fri Jan 20, 2017 4:22 pm

Hi having difficulty with my Pro Trinkets. One of the two that I ordered does not run the bootloader at all (the red LED does not light when I plug it in or press the button). The second of the two was functioning ok yesterday, but after a while it was clear some code was not implementing properly upon start up, and today the bootloader is not functioning properly (the red LED triple blinks for about 5 seconds and then turns off and I'm getting a "Could not find USPtiny device" error. I tried attaching a resistor between the RX and 5V pins but that had no effect on either board. Help please?

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Re: Pro Trinkets not Bootloading Properly

by adafruit_support_rick on Mon Jan 23, 2017 8:14 am

Please try some different USB cables. You may have a bad one.

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Re: Pro Trinkets not Bootloading Properly

by kseto on Mon Jan 23, 2017 10:30 am

Thanks for the suggestion. I've tried three different USB cables. The first Pro Trinket definitely does not bootload. The second one seems to work only when it wants to... I suspected that the second time it worked, it might have been the cord or a loose micro USB connection, but I left it plugged in and untouched overnight, and when I came back to it the next morning, the bootloader was not working properly again.

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Re: Pro Trinkets not Bootloading Properly

by adafruit_support_rick on Mon Jan 23, 2017 10:57 am

We can replace the first one, the one where the red LED does not light. However, the second one sounds like a connection problem. You might try connecting through a self-powered USB2.0 hub.
Please email support@adafruit.com with a link to this post for a replacement Pro Trinket

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Re: Pro Trinkets not Bootloading Properly

by mattiascibien on Sat Jan 28, 2017 5:25 am

I had the same problem with one of that but I bought one from a reseller. Is it possible to get a replacement even in this case?

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Re: Pro Trinkets not Bootloading Properly

by franklin97355 on Sat Jan 28, 2017 2:26 pm

mattiascibien what have you tried to solve your problem? I would recommend contacting your reseller as to what they will do for you.

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Re: Pro Trinkets not Bootloading Properly

by noomicorn on Tue Jan 31, 2017 7:17 pm

I am having this problem too with 3 out of 4 Pro Trinkets I got in the same order. I've tried different cables, but I don't see how that can be the problem if one of the Pro Trinkets works and the others do not on the same cable.

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Please be positive and constructive with your questions and comments.