Would reset the roll once: "First switch on the speaker. Then press the power button and the volume down button at the same time until the UE Boom plays a sound. The speaker will now turn off. Then switch the speaker on again". Good luck.

Why a sale? It doesn't say "sale" anywhere. One is the old version and the linked one is the new one... PS. The questions, answers and discussions should explicitly refer to the products and their function. General questions about your own orders, delivery times or prices should be asked directly to our customer service. - https://www.digitec.ch/de/Wiki/4490

The UE ROLLs have already been officially introduced and released by Logitech. However, we do not currently have them in stock and expect a delivery time of approx. 9-11 working days when ordering (as of 29.06). Please note, however, that the current delivery date is stated directly with the product and is subject to change at any time.

I only know the UE Boom from friends. The UE Boom are a bit louder. UE Roll are connected faster in comparison.