(tr)uSDX Forum

On two of my (tr)uSDX I have flashed the bootloader via ISP but I cannot flash the firmware vis USB. Before trying all the solutions recommended in this forum I have one question that I didn`t find already answered.

My (tr)uSDX show the following behaviour: Every time I power them up a different serial number is displayed. Is this normal or should there be a fixed serial number after flashing the bootloader?

Thanks and best regards
Dieter DL1DBY

I had a serial number that kept changing and it was the result of a bad bootloader installation. I ended up having to use a USBasp programmer to get the firmware loaded correctly.

Thanks for the information. I'll try to reflash the bootloader.

Ever changing Serial Numbers are a sign of wrong fuses.
Make sure, while burning bootloader, to have the Fuses set to the correct Values.
Check Screenshots on Bootloader Page for Details.

73 Manuel, DL2MAN

Thanks, reflashing the bootloader (with special attention to the fuse settings) solved the issue.

Though I cannot say by now whether I used wrong fuse settings in the first attempt, the chances for this are high.

Best regards
Dieter DL1DBY