Sennheiser on Twitter: "The new PXC550-II firmware (v 1.5.21) ensures compatibility with iOS 13.4. Please update your PXC550-II to the new firmware before you update your phone to iOS 13.4 and enjoy
ISITZEN — Sennheiser Presence Firmware
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EPOS I SENNHEISER IMPACT SC 260 USB MS II Headset | 1000579 - Headsets Direct, Inc.