If none of the above solutions worked for you, the problem might lie with your Steam app. It might be the case that the installation of Steam is corrupted or certain installation files are ...
In that case, try clearing the app cache for the Steam app. It can also be caused due to corrupted installation of the Steam app. Hence, if the scenario is applicable, you should be able to fix ...
The Decky Loader program will re-install. When it's finished Power off the Steam Deck and restart. When the Steam Deck is back in Gaming Mode, press the QAM button and the Decky Loader app should ...