Hello!,
I had the same problem, mentioned in another thread:
Upgrade over USB didn’t work I got timeouts every try, or driver didn’t get correctly loaded on every reset. So you can do the upgrade also over the serial port. But there is no documentation and the flasher uses always USB1, so the trick is to put the attached .ini file in the %APPDATA% folder (just enter %APPDATA% in the explorer).
In the .ini file you can specify another uart and baudrate:
[CommPort]
Port=COM1
ComBaud=115200
Then start the upgrader and enjoy
But finally I’m really disappointed from the documentation of such things
HL85xx_download.ini (37 Bytes)