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ALT (Option) Dosen't work for Anything Command at start

i will use startup manager for booting with usb device but ALT ( Option) doesn't work at starting up, i search solve in google i find to reset NVRAM with "CMD + Option +P+R" This command doesn't work too because ALT ( Option) not working for any Command have this button

ALT (Option) Work in OS but at starting up not working please help me!!

I disable SIP and i Enable it and no result.

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Are you holding alt 100% of the time before and after pressing the power button until the boot selection menu displays?

It may take around 10-30 secs while holding alt.

Depending on which OS was installed some may take longer to show it when trying to get to the EFI boot menu.

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Yes Sir i holding ALT 100% and i holder it before and after and sam result..

i think ALT button has Disabled on my mac at startup because all Command with ALT doesn't Work (Shift+Control+ALT, CMD + ALT + P+R...) all this command not working because have button ALT.

if i holding ALT 30 secs or what ever MacBook login to OS Sierra like i doesn't hod it..

i Try Reset PRAM from Terminal no result..

this problem happened after i disabled (SIP) last month i activated again and nothing

if you have solution please to flash or reset all setting to default please tell me how

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Ayoub wird auf ewig dankbar sein.
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