Important upgrade/downgrade instructions: * Any phone running an 8.9.3.x or higher firmware should not be downgraded to a version below 220.127.116.11. * This may lead to a deadlock situation where the firmware works, but the phone cannot be updated anymore at all! * All versions lower than 18.104.22.168 are affected by this update procedure issue. * Only option left to get out from such deadlock situation is to use the network recovery procedure as described in the Snom support How-to * If the downgrade is mandatory, use the 22.214.171.124 as an intermediate firmware downgrade step, before you finally install the desired/known as affected version! * Please note: if you experience the deadlock situation do not open an RMA case, as this is not a hardware/flash issue!
1. Right-click on one of the following links and choose Copy shortcut:
2a. Open the Web User Interface and navigate to the Software Update page
2b. Paste the link into the Firmware field
3a. Press Load
--> The phone reboots and may ask you to perform the update
Note: Do not disconnect the power at anytime!
3c. Check you firmware version afterwards:
Press once then
The firmware version is displayed:s300-SIP X.Y.Z