#How can I update the Sonoff Zigbee3.0 USB Tongle Plus firmware?

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zinc hazel
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I try to use the Aeotec Range Extender ZI (ZGA001-C15) with the Sonoff ZBDongle-P, but in Zigbee2MQTT App, but the Extender is not be found. I have read, that the Dongl needs a newer firmware: CC1352P2_CC2652P_launchpad_coordinator_20250321.hex. But it will not flash the Dongle. what can I do?
THX for help Hannes