I updated the firmware using the link in page 31 (21/11 recommended UPDATE) and set the following

Fan percentage to 30%

Global settings
Frequency: 431M
Asic volatge: lowest

Chain 1
Frequency: 462M
Asic volatge: 1

Chain 2
Frequency: Use global
Asic volatge: Use global

Chain 3
Frequency: 425M
Asic volatge: 1

Been running for about 1hr and I have a HW 5 in chain 1 with discarded 2,177 on my main pool. Is this normal? What's the meaning of HW 5 and discarded? I'm new on using an asic miner.

https://drive.google.com/file/d/1WVTntaP57RZELlobqCan09wAbBjTyyPv/view