[BRLTTY] problems after upgrading to brltty 5.4

[J.G]

Hi,

here is a question:

I'm using Win7 (32-bit) with NVDA, which is attached to Alva Satellite
through brltty and serial to usb converter. After I updated brltty, a
display does not work. What should I do to solve a problem?
In brltty configurator i chose Alva and "com1" because my converter is on com1.

Thanks