i don’t know what happens but i think i did a mistake doing the update, but considering that i had the dual boot i thought that the update would have touched only the steam os partition and not creating problem. anyway. you get the point, now starting the steam deck only the secondary boot win 11 is accessible … what can i do?
Most likely there was a firmware update. If using refind for dual booting do the following. Boot into the bios (Volume Up + Power Button) choose boot from file, find a folder named efi, you may have to check serveral locations, and boot steamcl.efi. Once back in steam switch to desktop open refind create a new config and install config. That should fix it.