If you’re a Mac user and you need to view or directly manipulate firmware variables in NVRAM on your computer, be aware that this can be risky and not recommended for most users. While most users have no business interactions with NVRAM, there are times when manually viewing and clearing NVRAM variables can be helpful for troubleshooting. ..

To read and modify the firmware in Mac OS X using a command line utility, use the following command: firmware-mod

Nvram variables should not be deleted unless they are known to be necessary. ..

If you want to use a graphical user interface, run the following command: Terminal

How to View all NVRAM content on the current Mac

nvram show

$ xml2 -p output.xml

..

If you don’t specify the -x flag, you’ll likely see a lot of gibberish, XML, and maybe some plain text that’s easy to read, but for the most part, this data will only be relevant to advanced Mac users for troubleshooting purposes. ..

nvram -p output might look like this: $ nvram -pefi-apple-payload-data 20% 10% 00% CC% 00U% 00P% 00D% 00A% 20% 10% 00% CC% 00U% 00P% 00D% 00A%, 20 % 10 % % CC % U % 01 , 20 % 10 % % CC % U % 02 , 20 % 10 % % CC % U % 03 , 20 ..

Advanced Mac users can find useful details in the NVRAM if they know what to look for. ..

How to Clear all NVRAM from the command line in Mac OS X

nvram deleteall

If you want to make the changes to your Mac that are required for the new security features, you will need to restart it. Unless you do something else, you may just want to reboot from the command line while there.

Delete specific NVRAM variables on Mac OS X

nvram delete -d “MyVariableName” ..

nvram -d “name of variable”

nvram set system audio to “off”

Continue with nvram adjustments

nvram -help This command provides help for the nvram command.

nvram -helpnvram: nvram is a command line tool that allows you to view and set firmware variables. The following options are available: -x Use XML format to print or read variables (must appear before -p or -f). -p Print all firmware variables. -f Set firmware variables from text file. -d Delete the named variable. -c Delete all variables. ..

Resetting the PRAM / NVRAM on a Mac can be helpful in troubleshooting certain issues, and removing everything from NVRAM is similar to the -c flag during an actual restart. This is especially valuable for working with remote machines connected via SSH or found elsewhere on the network, where it would be impossible to manually reset NVRAM with a series of hot keys. ..

When the Mac App Store loads a blank screen that isn’t filled with content or storage data, clearing nvram can help solve the problem.

How to View & Clear the Mac NVRAM Contents from Terminal in Mac OS X Guide is free?

How to View & Clear the Mac NVRAM Contents from Terminal in Mac OS X: benefits

How to View & Clear the Mac NVRAM Contents from Terminal in Mac OS X Tutorial: final note

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