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: For models like the GS4 or GX290 , you may need to download a .zip update package from the Gigaset Service Portal to your phone's internal storage and initiate the update from the recovery menu or specialized local update settings. Troubleshooting Update Issues Gigaset SL910-SL910A

The update is only neccesary, if the customer has one of ... - Gigaset gigaset firmware download