Aug 26, 2020 Out of the blue this morning, I get the "Cannot Open Port" error (or course, when I'm on a time crunch and need to fix something on a customer's.... But the problem is the blasted "cannot open port" error which means software is as good as useless. I have a 3ghz intel pc with windows XP home edition SP2.. Dec 29, 2020 could not open port COM4: [Error 5] Access is denied. Added by Ian ... Whenever I try to program my UV-5R I get the above error. Port COM4 is... df76b833ed latvwhi
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