Custom Firmware With Baseband 6.15 Official

The warning text was stark: “This is irreversible for iPhone 3G. For iPhone 3GS, downgrading is impossible.”

For the : Suicidal. You were gambling a functional phone for a 70% chance of a brick. Custom Firmware With Baseband 6.15

They don’t make exploits like that anymore. And frankly, after the 06.15 graveyard, that’s probably a good thing. Do not attempt to flash 06.15.00 onto any modern iPhone (iPhone 4 and later). The baseband contains anti-replay counters that will permanently desynchronize your device from Apple’s activation servers, resulting in an irrecoverable "No Service" brick. This feature is for historical and educational analysis only. The warning text was stark: “This is irreversible