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Non-volatile random access memory; RAM that doesn't lose the stored information when the power is turned off, unlike traditional RAM

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Setting a NVRAM variable in normal boot not permitted but allowed in recovery mode

If memory serves me right then in Yosemite it was possible to set the NVRAM variable agc with nvram boot-args even in normal full boot mode. This seems to have changed in later versions of the OS. … In Sierra this results in an error message: sudo nvram boot-args="-v agc=0" nvram: Error setting variable - 'boot-args': (iokit/common) general error If I issue this command in recovery mode it is still …