IdeaPad S205: BIOS/EFI menu not accessible after adding a new boot entry using the bcfg command

Hi community,
I just got a new S205 and wanted to install Win7 and archlinux in dual boot (GPT formatted SSD).
Win7 installation worked like a charm. Archlinux worked well aswell, unfortunately i couldn't make a boot entry following this guide: https://wiki.archlinux.org/index.php/Beginners%27_Guide#EFISTUB
So i had to manually create the boot entry using bcfg command in an efi shell:
https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_Interface#bcfg
The first attempt (I double checked that i got the right filesystem [fs0] and so on) failed and resulted in an automatic reboot. After this I immediately reentered the efi shell and tried again. This time I could create the boot entry.
Now if I reboot everything seems fine (I can dual boot Win and arch) BUT I cannot access BIOS/EFI menu via F2 anymore. It seems like it just does not exist anymore. How do I get it back? Should I just flash over with the original EFI from the Lenovo download page? I could theoretically do that (I can still change boot order using my arch live medium), but i could not reset EFI prior to flashing... which is always recommended to do.
So I am - again - pretty stuck with this EFI. I hope you can help and tell me what to do.
This EFI-Implementation on the S205 must be the worst piece of "engineering" ever.
Nothing works the way it is intended to... I would not dare to wash my hands clean off any faults, but ADDING a boot entry resulting in a not accessible BIOS/EFI menu... there's just something wrong.

At least I now know what the problem is:
It seems like the S205 can only keep 7 boot entries in NVRAM (Can anybody concern?).
As I already have 7 boot entries:
adding a new entry using efibootmgr tool does not work (fails without error) and gummiboot doesn't work either. Nevertheless, adding a boot entry (for rEFInd) from within the UEFI shell works, but seems to result in deleting "Boot0000" aka Setup which then breaks my EFI. Breaking meaning that I cannot access it anymore.
I can however (and did so twice yesterday) flash the original EFI from within Windows and thus gain access to the EFI menu again. Nevertheless this resets my boot entries again so the refind (or gummiboot) bootloader gets deleted again and only Win7 is bootable.
Now what would be the smartest way to dual boot this system? Which of the boot entries is safe to delete so i could install refind/gummiboot instead? For instance, I don't know where USB FDD and USB CD come from. Can I delete them? Or won't I be able to boot from external CD-ROM or USB drive anymore if I delete them?
Or would it be best to delete the Win7 bootloader and try to have refind/gummiboot boot it? And will they at all be able to still find the Win7 boot files once I deleted Win7's boot entry? When I install refind as bootloader and manually add an boot entry for it using the bcfg boot add command it is able to load Windows7. But will this still be possible if I delete the Win7 boot entry? It would most likely be possible - I assume - if the Win7 boot files (on the EFI system partition) were still there even after deleting the boot entry. Can someone tell me how deleting a boot entry exactly works and which files get or don't get deleted?
Best regards.

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