
SCEWIN /o /s nvram.txt /h Hii.db /v /q

Or (Try both, on each version)

SCEWIN_64 /o /s nvram.txt /h Hii.db /v /q


After edit, if editing, save the nvram.txt and flash back with command

SCEWIN /i /s nvram.txt

or 

SCEWIN_64 /i /s nvram.txt
 

afterwards it's suggested to do a globalreset with FPT (use FPT from Intel System Tools package version that matches your system ME)

fpt -greset


