downgrad 3gs f.w. 4.1 modem 6.15 to 3.1.3 needed - GSM-Forum

mxkey lover · 01-02-2011, 18:03

hi all
kindly i need to now how to downgrade 3gs 4.1 modem 6.15
to 3.1.3 with custom firmware

best regards

vascof1 · 01-02-2011, 18:08

only via flash IC programing with programmer
you need to desolder flash ic

br

mxkey lover · 01-02-2011, 18:24

thank you
but is there any other idea

nigrose · 01-03-2011, 02:14

dont no if this help u any as i picked up some were says 3g not 3gs
done at your own risk

3G with bootloader 5.8 The procedure is fairly straightforward, however we would not recommend novice users to try this. We will also highly recommend you to backup everything on your device before following the procedure. Proceed at your own risk only.

Here's what you need:
· Jailbroken iPhone 3G
· Fuzzyband installed via Cydia
· afc2add installed via Cydia
· i-FunBox (for Windows) or DiskAid (for Mac)
· Certificate to use with Fuzzyband.
All what you have to do is follow my steps :

STEP 1 : First download the required file ICE2-06.15.00.cert from here.

STEP 2 : After that install Fuzzyband from Cydia and launch the app

STEP 3 : Connect your iPhone 3G to PC using USB cable

STEP 4 : Launch i-FunBox and select file then navigate to Applications/Fuzzyband.app, right-click and then select Copy from PC.

STEP 5 : Select the ICE2-06.15.00.cert file you downloaded earlier and then copy it to this location: Applications/Fuzzyband.app.

STEP 6 : Now simply disconnect your iPhone from your computer and start Fuzzyband app (which you previously installed using Cydia) on your iPhone.

STEP 7 : In Fuzzyband, you will now see your current version of Baseband, (which should still be 06.15.00). But now you will have the option to downgrade it to version 05.13.xx.

That's it you are done...Once you have downgraded, Go to Settings –> About, and scroll down to check your Baseband which should now read 05.13.xx (which is unlockable via Ultrasn0w). You can now also update or restore any firmware without iTunes throwing errors.

01-02-2011, 18:03	#1 (permalink)
mxkey lover Freak Poster Join Date: Jan 2010 Location: iraq Posts: 172 Member: 1212320 Status: Offline Thanks Meter: 46	downgrad 3gs f.w. 4.1 modem 6.15 to 3.1.3 needed hi all kindly i need to now how to downgrade 3gs 4.1 modem 6.15 to 3.1.3 with custom firmware best regards

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01-02-2011, 18:08	#2 (permalink)
vascof1 No Life Poster Join Date: Dec 2003 Location: Baltchik,Bulgaria Age: 50 Posts: 1,250 Member: 47236 Status: Offline Thanks Meter: 58	only via flash IC programing with programmer you need to desolder flash ic br

01-02-2011, 18:24	#3 (permalink)
mxkey lover Freak Poster Join Date: Jan 2010 Location: iraq Posts: 172 Member: 1212320 Status: Offline Thanks Meter: 46	thank you but is there any other idea

01-03-2011, 02:14	#4 (permalink)
nigrose Junior Member Join Date: Nov 2010 Posts: 5 Member: 1437153 Status: Offline Thanks Meter: 1	dont no if this help u any as i picked up some were says 3g not 3gs done at your own risk 3G with bootloader 5.8 The procedure is fairly straightforward, however we would not recommend novice users to try this. We will also highly recommend you to backup everything on your device before following the procedure. Proceed at your own risk only. Here's what you need: · Jailbroken iPhone 3G · Fuzzyband installed via Cydia · afc2add installed via Cydia · i-FunBox (for Windows) or DiskAid (for Mac) · Certificate to use with Fuzzyband. All what you have to do is follow my steps : STEP 1 : First download the required file ICE2-06.15.00.cert from here. STEP 2 : After that install Fuzzyband from Cydia and launch the app STEP 3 : Connect your iPhone 3G to PC using USB cable STEP 4 : Launch i-FunBox and select file then navigate to Applications/Fuzzyband.app, right-click and then select Copy from PC. STEP 5 : Select the ICE2-06.15.00.cert file you downloaded earlier and then copy it to this location: Applications/Fuzzyband.app. STEP 6 : Now simply disconnect your iPhone from your computer and start Fuzzyband app (which you previously installed using Cydia) on your iPhone. STEP 7 : In Fuzzyband, you will now see your current version of Baseband, (which should still be 06.15.00). But now you will have the option to downgrade it to version 05.13.xx. That's it you are done...Once you have downgraded, Go to Settings –> About, and scroll down to check your Baseband which should now read 05.13.xx (which is unlockable via Ultrasn0w). You can now also update or restore any firmware without iTunes throwing errors.