Experts note that modern iOS security (especially on devices not vulnerable to certain bootrom exploits) makes a simple "custom firmware flash" for a permanent, full-feature unlock highly unlikely .
Some reasons include:
If an iPhone 7 Plus is locked, the most secure and reliable path is through official channels: Apple Support:
: Download a third-party flashing tool (like 3uTools ) and the specific "custom IPSW" package for the iPhone 7 Plus .
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