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Modem downgrade (rollback / downgrade) from 06.15.00 to 05.13.04 for iPhone 3G / 3GS

Понижение модема (откат/даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G/3GS

Finally, the possibility of a modem downgrade. Work GPS is waiting for you. For verification, you can use standard maps, if the blue dot blinks in circles, then the GPS is working. If the point is static, then AGPS works.

Important! You can go down from any bootrom, and only ONLY WITH MODEM 06.15.00 !

Only who has the iPhone 3GS 2011 phone 23 weeks and newer - Starting from about 23 weeks since 2011, apple began installing new flash chips on iphone 3gs phones. This led to the fact that it became impossible to unlock the phone through the modem's firmware from the ipad, the phone was "dying." But, as it turned out, this chip was not installed on all iphones ... Whoever has the iPhone 3GS phone - 2011 is 23 weeks and newer, you will have to check in the workshop what chip you have (open the phone).

If the chip number is 36MY1EE , Spansion S72NS128RD0HL or Spansion 72NS128RDOAHBLO, you can safely update the modem.

If the chip number 36MY1EH , do not update the modem , it will kill the modem flash drive phone!

Redsn0w

Download redsn0w 0.9.15b3 [WIN] redsn0w 0.9.15b3 [WIN] redsn0w 0.9.15b3 [WIN] Virus Free by KAV
Download redsn0w 0.9.15b3 [MAC OSX] redsn0w 0.9.15b3 [MAC OSX] redsn0w 0.9.15b3 [MAC OSX] Virus Free by KAV
Download redsn0w 0.9.14b2 [WIN] redsn0w 0.9.14b2 [WIN] redsn0w 0.9.14b2 [WIN] Virus Free by KAV
Download redsn0w 0.9.14b2 [MAC OSX] redsn0w 0.9.14b2 [MAC OSX] redsn0w 0.9.14b2 [MAC OSX] Virus Free by KAV
Older versions of RedSn0w: Старые версии RedSn0w blog.iphone-dev.org

Custom firmware for 3GS

In order for the activation to work, you need to restart your iPhone twice.

Custom firmware install at your own risk!

Custom firmware with modem update for 06.15.00 (from iPad)

With modem 06.15.00 New bootrom + activation download
With modem 06.15.00 Old bootrom + activation download

Custom firmware without updating the modem .

No modem New bootrom + activation + jailbreak download
Without modem Old bootrom + activation + jailbreak download

Step-by-step instruction

1. Run the utility redsn0w.exe (On Windows, of course , with administrator rights!) .

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Next, click on Extras , then on Select IPSW and point to the file in advance of the downloaded firmware that is currently installed on your phone. If you have an iPhone with a new bootrom, then you are missing this item.

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GSПонижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GSПонижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Click OK on the request.

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Next you will see a question about your version of bootrom. Click Yes , if the new butrom or No , if the old.

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

To find out what is the BR of your iPhone, on the main page of the program rednsn0w (In new versions), below there will be information about the connected phone.

In the rednsn0w program on your computer, return to the first menu with the Back button .

2. Next, follow the utility menu items, first completely turn off your iPhone, swiping your finger across the red slider. This is important because affects further firmware!

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

3. Making money on jailbreak .

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Preparation will begin.

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

4. Set the checkboxes to Downgrade from iPad baseband and uncheck Cydia if it is already installed.

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

5. Next, click on Next, and follow the activity of the lines for entering the iPhone into the DFU.

  • 1st line 3 sec hold power button
  • 2nd line, do not release the Power button and hold Home
  • 3rd line, release the Power button, and the Home button hold until the display turns white on the phone.
Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GSПонижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Again, the preparation process ...

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Your phone will reboot ...

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

The window that everything is ready, but the phone is not disconnected from the computer! ...

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

After you see the standard Pwnapple logo, Flashing Basenand appears on the screen.

IMPORTANT! This operation will take a long time, about 3-8 minutes. After everything is finished, your iPhone 3G or 3GS will reboot, but with modem 05.13.04 , which can be unlocked using ultrasn0w from Cydia. HOORAY!

Понижение модема (откат, даунгрейд) с 06.15.00 на 05.13.04 для iPhone 3G и 3GS

Problems and Solutions

1. If the modem is lowered, but the network does not catch, reinstall Mobile Substrate in Sidium and restart the phone.

2. If the modem after all actions remained 06.15.00, we reflash the modem at 06.15.00, we repeat everything again. I advise you to try on different firmware. And on a clean phone!