You have played soft 3.1.3 and you cannot remove the SIMLOCK? Lower the baseband version
Software 3.1.3 came out of the way. It was not officially announced, so the changes seem to be purely cosmetic. After updating my iPhone 3G, I noticed that Apple focused mainly on changing the baseband and fine-tuning its security, rather than on the operation of the phone itself. Since the premiere of 3.1.3, the number of dissatisfied users has been increasing. The biggest problem, however, is those who have so far removed the SIMLOCK blockade by BlackSn0w. By uploading 3.1.3 their phone became unusable.
However, it was possible to downgrade the baseband thanks to the Fuzzyband application. It allows you to go back to baseband to version 05.11.07, that is the one that was installed with software 3.0. Unfortunately, this walkthrough can only be used by iPhone 3G owners with bootrom version 05.08, and this one was installed only in the initial production phase. How to check bootrom and downgrade baseband?
We run Cydia and download the Fuzzyband application. Then run the program. It will start checking the version of the bootrom, baseband and installed software.
If our bootrom is compatible, we will be informed about the supported bootrom version and the Flash option will be active. If our bootrom is higher than 05.08, the program will not allow us to continue our work.
Let’s establish that our iPhone has bootrom version 05.08. So we press the Flash button. The device will start working and flashing the baseband. This will take approximately 5-8 minutes.
After the Flash process is over, the I HAZ DOWNGRADE message will appear. We turn off the application, restart the device.
After launching, go back to Cydia and add a new repository – http://repo666.ultrasn0w.com. After refreshing it, we find the ultrasn0w application through the search engine. The program must be installed. After installation, restart the software. The phone will have the SIMLOCK removed.