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ALT (Option) Has Disabled From MacBook At Startup & stay working in OS

ALT (Option) Has Disabled From my MacBook Pro At Startup i cant Load Startup Manager with this button But it working in OS but in startup (Power on) doesn't working.

i cant use Reset NVRAM (CMD + ALT+R+P ) because ALT don't stay working at boot

if i try reset NRAM MacBook go to Recovery Mode not NVRAM mode because it read only (CMD+R+P) not read (CMD+ALT+P+R)

i think ALT Disabled from my MacBook pro because i try Some Command last days like i disabled "SIP".. i enabled it again and no result ALT stay not working..

Please Help me i want boot with USB device for Install Mac OS to another Partion in my Hard Drive...

Update (12/20/2016)

Thanks Dan & Bob but my problem not in startup manager the problem in ALT button does't work at Bootloader but it stay working in OS.. I try an external keyboard and not working too

i thank ALT disabled in my MacBook because i used some commands in terminal last days like i disable "SIP" and something like that and ALT button has disabled from my MacBook.

how i can reset all configure to enable ALT again ?

Maybe OS was disabled this button in startup ? if i remove partition ALT reset to work ?

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What is your current OS on your system MS Windows?

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OS Sierra 10.12.1

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I think you're going to need to bring your system to an Apple Store to have them take a look at it.

I've never encountered a keyboard issue like you describe here. The systems firmware doesn't have any means to over-ride the keyboard at boot that doesn't still have problems after the boot up.

The only thing I can think of is the keyboard firmware needs updating. Review this Apple T/N: About EFI and SMC firmware updates for Intel-based Mac computers. Make sure your systems firmware is at the listed level or newer. The OS installer should have updated it but I've seen a few cases the installer failed to install the needed updates. Which is why you'll need to visit an Apple Store as they have some tools to force it.

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Thanks sir i will try update EFI and SMC if does't work will go to Apple Store to give me solution, thanks again

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SMC Update was installed.. but EFI update tell me "This update requires OS X version 10.8.5 or 10.9.5" i must use OS 10.9.5 for this update ? i cant use it in mac sierra 10.12.2 ?

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Sierra has a newer update within the OS installer. The point here was to check before you applied "Make sure your systems firmware is at the listed level or newer"

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My Update list is MacBook Pro (15-inch, Late 2011) / MacBookPro8,2 i downloaded last Update from your link.. so what i do now sir ?

i must use OS 10.9.5 for install this update ?

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OK, lets do this, can you give me what your systems levels are looking at the report.

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