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1)What was the uplink data amount?
What is the sum of downlink/uplink data?
Could you provide some screenshots with actual data consumption and data calculated by the router?
Attach the screenshots by editing your question.
2)Depending on the time zone your router has configured in its NTP settings, displayed hours in Status -> Mobile usage -> Day may be incorrect as it shows hours in UTC time, independent of the configured time zone. It is a known issue and should be resolved in future firmware releases.