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  1. Check the release notes for version 8.4.35 carefully!
  2. Check the change log for firmware branch 8.4.x carefully!
  3. Perform the update from V8.x to Version 8.4.35 following the steps below:

Right-click on the following link and choose Copy shortcut:
snom820 8.4.35 snom821 8.4.35 snom870 8.4.35

Open the Web User Interface and navigate to the Software Update page

Paste the link into the Firmware field

Web User Interface -> Software Update -> Firmware

Press Load

--> The phone reboots and may ask you to perform the update

Note: Do not disconnect the power at anytime!

Check you firmware version afterwards

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