[Curious] Bootloader 101 Needed
Here is what I know:
The original 3.9BL allowed unlocking. How?
Then came a newer 4.6BL that could not be unlocked until geohot's miracle.
I was using iPlus to unlock and downgrade my 4.6BL to 3.9FB. I had the seemingly standard problem where I had to run through it twice.
When I restored the 1.1.4 after having the 3.9FB I noticed that even though the phone was still not activated or jailbroken, I could see the phone was unlocked because it connected to T-Mobile.
So, how was that possible?
Why is the 3.9FB or regular 3.9BL safer to have than the 4.6BL if either can be unlocked? (know the 3.9 is desirable to keep the BB matching the firmware)