downgrade iphone 3g on 4.2.1

[big-g]

hi ,
i have a iphone 3g 8gb running 4.2.1 and jailbroken modem firmware is 05.15.04 its so slowwwwww and want to downgrade to 3.2 or something that makes it faster how do i go about it dont want to end up with a brick need to know what to do? and what to bk up? where to get software? please help this phone is slug slow drivin me wild!!!!!!!

[fijiman]

Most of the tweaks/apps your running on 4.2.1 will be slower or won't work on lower firmware..... If I were you I would backup your iPhone with iTunes and Restore firmware back to 4.2.1 and setup as a "New iPhone" Don't restore from an old backup...reinstall any Cydia apps from scratch....Every 3-4 months I tend to wipe clear my iPhone with a Restore and setup as new...

[aggrav8or]

Hi,

I found this tutorial on another forum and tried it on my iPhone3G.

It runs really well.

Here you go:

I decided to make my 3G able to run multitasking and homescreen wallpapers. As people who are in the know with the iPhone 3g and ios 4.2.1, Apple changed the openGLS compatibility with the device, which made the use of multitasking difficult since if you were in an app, and then used multitasking o move to another app, you would respring your device, and then have to exit Safe mode). I will talk about the solution for this during this post.

So to start off with, I performed a CLEAN install of ios 4.2.1 (not restoring from back up).
Straight after the restore (without syncing anything to my 3G) I Jail-broke with redsn0w 0.9.6b5. If you want multitasking and homescreen wallpapers, it is important to select both these options with the redsn0w application (I will talk about this later).
When your iPhone has rebooted and shows the Cydia icon on your homescreen, go into Cydia, set up the filesystem, and then after the reboot go into cydia to start the magic

First off, we want to stop unnecessary Daemons from slowing our device. To do this, I have simply used a Cydia Tweak called Daemon Tools. It is found on the repo repo.insanelyi.com. I have never found a problem with my iPhone after I have let this package take away some unnecessary Daemons, so hopefully you wont have a problem either.

Once Daemon tools is installed, I then installed Springtomize from the sinfuliphone repo. This app is great at removing features that will speed up your iphone a lot.

Once Springtomize is installed, go into it (Settings > Springtomize) and apply these tweaks

General - Disable Spotlight ON
Icons - Hide Shadow ON
Icons - Disable Jittering ON (Optional, but makes moving apps easier)
Dock - Hide Icons Reflection ON
Lockscreen - Slider - Custom Sting ON (leave the custom string empty) - In my experience this makes the lockscreen less laggy upon waking up from sleep
Folders - Remove Animation ON
App Switcher - Start Editing ON (Allows the multitasking Apps to automatically appear with an 'X' icon to remove from the multitasking tray)
Animations - Custom Duration ON (Have the slider bar almost all the way to the left) This option determines the speed of the animations that iOS makes, for example when moving through settings options.

Even though you are able to 'enable' homescreen wallpapers and multitasking in Springtomize, I ran into some difficulty enabling homescreen wallpapers via springtomize. After i enabled it in the springtomize settings area, I would not be able to choose what my homescreen wallpaper was (It stayed on the default waterdrop one). So if you want homescreen wallpapers and multitasking, it is important to select these features when jailbreaking via redsn0w.

After you have done this, respring.
Make sure that to make your device even faster, you remove all of the Spotlight indexing options in Settings (Settings > Spotlight Search), and to turn MMS off.

IMPORTANT FOR MULTITASKING: If you want multitasking to properly work, you will need to edit the plist file via SSH or iFile. Help on how to do this is available here (FIX: How to make Multitasking work in ios4.2.1 without crashing - SiNfuL iPhone)

After I had done this, I then went on to install SBSettings (because I like the 'free processes' feature it has), and also bitesms (because of the ability to reply to text messages while having another application open behind it.)

After I applied all of the above tweaks, I am left with about 60mb of free memory after I remove all my multitasking apps and I use the free memory option in SBsettings (Just under half of the total amount of ram the iPhone 3G has!).

Some important tips that I have found out while using my 3G has been to limit the amount of apps/tweaks that you download from both the app store and cydia, limit the amount of music, video etc you have on the device, and also perform monthly hard resets (holding the lock and home button down until the screen goes black, then rebooting with the lock button). Doing a hard reset twice or three times at the same time helps compared to just one reset.

My battery life is still decent with this set up. After a full charge, I will get around 2 days of use (normally this will consist of calling for 2.5 hours, 30min data use, 3 hour wifi, 1 hour music each day).