But for a brief, glorious year, 06.15 was the ultimate proof of concept:
Between 2009 and 2011, if you owned a locked iPhone 3G or 3GS on AT&T or O2, you faced a wall: software unlocks were dead. Apple had patched every vulnerability. The only way to use a prepaid SIM card on vacation was to install a custom firmware that did the unthinkable—update the baseband to an iPad’s firmware.
The hypothesis was insane: Flash the iPad’s cellular firmware onto an iPhone. On a cold night in March 2011, the Dev Team released redsn0w 0.9.6b5 with a checkbox that read: “Install iPad baseband 06.15.00.”
For the : 06.15 represents the peak of the "Wild West" era of iOS hacking—when a team of coders in their basements could overwrite the most secure component of a smartphone using a USB cable and an unsigned IPA.
This is not a current tutorial (it is obsolete and dangerous for modern phones), but rather a of a legendary jailbreak artifact from the iPhone 3G/3GS era. The Forbidden Firmware: Why Baseband 06.15 Destroyed and Saved the iPhone 3G In the pantheon of jailbreak lore, certain numbers carry weight. 01.59.00. 05.13.04. But none strikes fear and nostalgia into the hearts of veteran iOS hackers quite like 06.15.00 .
For the : Suicidal. You were gambling a functional phone for a 70% chance of a brick.
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 for iPhone 3G. For iPhone 3GS, downgrading is impossible.”