Updating software SVEN PS-390:

Step 0: Charge your device.
Step 1: Put the software into the root directory of the microSD card (please do not put music files in the microSD card);
Step 2: When the speaker is off, plug the microSD card to the speaker;
Step 3: Long-press the Power button to turn the speaker on, it will upgrade automatically;
Step 4: After upgrading, the light turns off and the speaker makes "didi" tone for three times, then turns off automatically;
Step 5: Pull out the microSD card, upgrading finished.

Remarks: The sortware could be used only for one time. If upgrade failure or need to upgrade one more time , you must delete the software from microSD Card, and try again from step 1.