Re:Don’t format a drive of M1 Macs from recovery mode
by sneak on Thursday February 18, 2021 @12:42PM
(#26182939)
> To do OS reinstalls, you want to be in 1TR.
I think the best bet, security-wise, if you really want to do a full/complete/total OS format/reinstall, is to boot external media, force zeroize all of disk0 (including 1TR), and use DFU mode to restore the .ipsw using Apple Configurator.
This is, of course, way more of a pain in the ass, and requires another computer, and internet access, but hopefully has the added benefit of leaving very little (really, the smallest amount practically possible without disassembly/extreme measures) persistent state on the machine from before the reinstall.
I think the best bet, security-wise, if you really want to do a full/complete/total OS format/reinstall, is to boot external media, force zeroize all of disk0 (including 1TR), and use DFU mode to restore the .ipsw using Apple Configurator.
This is, of course, way more of a pain in the ass, and requires another computer, and internet access, but hopefully has the added benefit of leaving very little (really, the smallest amount practically possible without disassembly/extreme measures) persistent state on the machine from before the reinstall.