Updated my UEFI - Now I can't get into gummiboot anymore

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https://bbs.archlinux.org – I have an UEFI Msi motherboard, which I've just updated. I run a dual boot system with windows7 and arch.  After rebooting, I can't get into gummiboot anymore and the "Linux boot manager" entry in my UEFI is gone. The only thing left there is "Windows boot manager", which causes the system to directly boot to windows without giving me the possibility of changing to linux. - Secure boot is disabled- Fast boot is disabledFrom what I know, upgrading the bios/uefi shouldn't even touch my bootloader at all, how could this happen? What do I have to do to get g (HowTos)