solution for ultrasn0w unlock problem in 6.15.00 bb 3gs new bootrom
Originally Posted by Rubley21
The Solution for ultrasn0w unlock problem in 6.15.00 BB 3GS (new bootrom), l found is, to re-flash the BB 6.15.00.
I myself, was stuck for full two days/nights facing this problem, while upgrading to innocent 4.3.3 from my iphone 3gs 4.1 fw and 6.15.00 BB (old bootrom). I checked all through the net and found this strange problem faced by many people and there is no logical answer from anyone! And also what i found that, the problem faced by the person who were previously in 6.15.00 BB and now want to do something with their iPhone.
so, the issue is what ever i did i was ending the process (i.e. redsn0w, sn0wbreeze, IReb rc4, tinyumbrella, Device manager and i don't know how many more) of jailbreaking process with corrupted 6.15.00 BB! So whatever the version of ultrasn0w i used, and what ever i did after that (modifying the root files, carrier .plist etc) i ended up as "No Service" or one bar or no carrier option in the settings.
so, the sum up of the solution is:
You need, Redsn0w, Sn0wbreeze, 4.1 IPSW stock FW
Downgrade your FW to 4.1 (this worked for me) using sn0wbreeze (Unless u don't know how to use sn0wbreeze, it's same like redsn0w but it can customize the stock FW of 4.1 so that itunes cannot throw the 1015 error). U can use sn0wbreeze version 2.1 (which works for FW 3.2.2 to 4.1) to do this. Follow the screen intructions. One thing more, if you find problem going to DFU mode use
redsn0w_win_0.9.9b9 (use the 'extras' > pwned DFU & can also use other version too). And if you still he itunes 1015 error use iReb to get out of this.
Use the redsn0w_win_0.9.6rc16 version (U can also use other version too) to install the 6.15.00 ipad BB only. This is the main step which will make your BB suitable for ultrasn0w 1.2 or above to unlock. Unmark any other option like install Cydia etc.
Unlock with ultrasn0w 1.2 or above (whatever the method with or without wifi). Reboot the device. If the settings>carrier option enabled, u r done. Give it 3-5 minutes for the first time to search for the carrier. that's it.
Sorry that I have taken so much time, coz i was frustrated myself once and i don't want to see anyone like me with 6.15.00 BB.