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That's interesting. What do you mean by firmware? The baseband software? I am quite sure I was able to install other but the newest iOS on an iPhone. What are

by biafra 15y ago

That's interesting. What do you mean by firmware? The baseband software? I am quite sure I was able to install other but the newest iOS on an iPhone. What are developers supposed to do if they want to test on older "firmware"?

kiiski 15y ago
I don't know how it works, but if it's not possible to use older firmware, why would developers want to test on it?
- biafra 15y ago
  Because there are user out there that did not upgrade.