1
Power on the terminal
Power on the SumUp Solo. Status OFFLINE often starts here: no power or not fully booted yet.
2
Check Cloud API
On the Solo: swipe down → Connections → Cloud API (sometimes labelled API). There is no Settings → Advanced → API Mode path.
3
Internet on Solo and iPad
Solo and iPad need internet. They do not have to be on the same Wi-Fi — mobile data on the Solo is fine.
4
Refresh status in POSBridge
POSBridge → Terminals → select the terminal → Status. If OFFLINE: power, Cloud API, internet, then tap Status again. After power-on wait up to 60 seconds.
5
Re-pair as last resort
If nothing helps: delete the terminal (Terminal → ⋮ → Delete) and re-pair. On the Solo: Connections → Cloud API → get a new pairing code and enter it in the app.