(adsbygoogle = window.adsbygoogle || []).push({}); First Thing First Your gonna Need iFile to Install Cydia..
You can get iFile For free at This Repo
You must login or register to view this content.

With Computer
Download this file You must login or register to view this content.
Drag it to your desktop
Use an Ftp client such as WinSCP to go to
/var
Make a New folder named "Downloads" Withput the "Quotes"
Drag the cydia File into the folder..
Wait about 30 Seconds
Respring your iDevice
Go on iFile
Navigate to
/var/Downloads
Tap on the cydia file
Pick Installer
Let it install
Then respring
Your Finished :420:

Without A Computer

Download "Safari Download Manager" Without the Quotes From
You must login or register to view this content.
Respring
Go to this link on your iDevice You must login or register to view this content.
Download the file
After its Finished Downloading tap the file
Pick Open in iFile
Once inside ifile Tap on the cydia file
Pick Installer
Let it install
Then respring
Your Finished

Now Your Prolly Wondering WTF would I use this for... Cause this comes Preinstalled with 4.2.1 jailbreaks.. Well this comes in handy if your Cydia is having any kind of problems whats so ever..

Recent Changes:
*Fixed “Manage Packages” Crash.
* Reduced loading changes time
* Section remapping optimizations
* Faster reloading data
* Faster, native search
* Uses public SDK classes whenever possible
* Rewritten, faster web views with zooming support
* Changes badge works again
* More stable webviews (no crashes when queueing)
* Redesigned settings page
* Redesigned stashing page
* Faster scrolling of table views
* Bug fixes
* Ads no longer break the package views until restart
* Much better queueing UI
* Stabler refreshing bar
* iPad improvements:
- landscape
- popovers
- modal views that cover only a portion of the screen
- less annoying errors with bad internet connections downloading packages
- updated section mappings, less typo’d sections

thanks m8 but this is a little old I have it since january

Anybody who jailbroke on 4.2.1 have it preinstalled.. but 4.1 needs to install this way nd I cannot find a tut on here.. :p

Plus reinstalling cydia can fix Some problems with Cydia's errors nd other bs.. :mudkip:

How can you check if the your cydia is allready up to date?

Open up cydia and scroll all the way to the bottom... It will say what device u r using... Its firmware.. What cydia version it is running... Nd the code ur idevice uses to save shsh blobs... Example. iPod 4,1(iPod touch 4th gen) iOS 4.2.1(what firmware ur running) Cydia 1.0......(the cydia u are running) 1eb39....(the code for shsh blobs.. Beginning letters/Numbers are prolly different on urs)