[xnzakg]

Following the same logic, you should never buy a phone used in case the previous owner installed a rootkit, and may also want to worry about rogue factory workers installing a rootkit before packaging the phone.

I think running a system restore should make the phone reasonably safe?

[chatmasta]

How do you know they didn't install a hardware rootkit while they were repairing your phone?

(btw, this is partially the logic of why Apple wants to forbid uncertified third party repairs)

[discordance]

Yeah exactly. Ultimately we have to trust someone in the supply chain, otherwise you're destined to live a life like rms.