The manual is very good in detailed and illustrated style.
Some hints will help.
- Do insert SD card in Step II, or this device will not power up;
- Connect Cable C1 with mainboard before the Mainboard case be closed in Step II ; (or you will suffering in Step V );
- There is no led indicator for powered up status, but a Yellow indicator for charging.
- Connect the speaker units(step V): seemed there is no preferred side, either will do.