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Many thanks, jb2cool, you've sorted my problem. Very much appreciated. The new firmware raises another question that I'll post in a new subject. In case my solution is useful to others, here's what I did: I have another OSTC, a 2N which connected fine to OSTC Companion, and from which I was able to ...

Hi all, I have a very old OTSC3 USB, serial 24XX Firmware 1.60. I've been having problems updating the firmware. Mac computer running OS 10.14.6. I've downloaded OSTC Companion 3.00 Beta 8. I've downloaded OSTC v311 HWOS firmware. I've downloaded / installed the FTDI-VCP Driver. It appears I'm havin...