We have followed the steps in your tutorial for testing and verification. The dashboard is accessible, and the data is displaying normally. The issue you encountered may be intermittent.
To better assist in diagnosing the problem, could you confirm: Are you currently booting your system from an SSD?
Additionally, after executing the following commands, does the problem persist?
sudo service pironman5 stop
sudo rm -rf /var/lib/influxdb/data/pironman5
sudo rm -rf /var/lib/influxdb/wal/pironman5
sudo service pironman5 start
You may also refer to the community discussion and solutions shared by other users regarding an empty dashboard here:https://forum.sunfounder.com/t/pironman-5-dashboard-empty/1218/51