I have done many of these over several years, But its been some time since the last time.
Normally I dump the rom 3-5 times and compare before anything else
Which I do have clean dumps, then I would search for $SVS and ff ff out every thing that follows that including the $SVS all the way down to the next large series of ff ff
Upon 1st boot I will zap pram a few times, Password IS GONE
yet the laptop is acting strange, powers off all of a sudden for no apparent reason.
Besides that, the trackpad clicker does not work in internet recovery and other odd...
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