1. how to install themes blackberry jad
Today we’ll explain how to install Blackberry themes.This tutorial is for those who
don't know or having troubles in installing applications on Blackberry. First you will
need to know two basic things which will not be repeated again in this tutorial.
1. How to copy a file to the memory card of a Blackberry?
First connect the BB* using a data cable to the PC. Then accept 'Enable mass storage
mode' request. Now the memory card will appear in 'My Computer' as a mass storage
device in your PC.

2. 2. How to access the filemanager in my Blackberry?
To access the filemanager, go to 'Media', then press BB button (left to the trackball/trackpad). Choose
'Explore'. Now you will see the file manager. You can access the media/memory card or phone memory from
here. You should be disconnected from PC or disable the mass storage mode in order to access the media
card.
You can install three types of files: .jar, .jad and .cod . Let's look at how to install applications in these
formats:
JAR or Java applications:
Blackberry has limited support for .jar files. It may or may not install on your BB. Because Blackberry do not
support some of the modules required by some .apps. So these apps won't install or simply gives errors like
'out of memory'. But there are java apps specifically written for Blackberry devices. These will install without
any hiccup. Here is how to install a jar file:

3. 1. Copy the jar file to the memory card.
2. In the BB, open the file manager. Browse to where you saved the jar file and click it. Now click 'Download'.
That's it. It may take a lot of time unless it is a blackberry specific application.
It may or may not install because most of the java apps are not designed for Blackberries especially games.
And there are some JAR file which requires a JAD file to install.
Jad or JAD files:
These are not application file but just descriptions about apps in other formats like .jar or .cod which may be
hosted on the Internet. You can edit/open it by simply renaming it to .txt. It usually contains descriptions like
vendor name, file size, time of creation, modules used etc.
To install it you should have a Data plan (means if have access to Internet using default web browser in your
BB, you can install it). Just copy it the memory card using mass storage mode and browse to the JAD file
(read about how to do this in previous JAR method). Click the file and then click 'Download'. The app will be
downloaded and installed within a few minutes.
If you don't have a Data plan, read this:

4. Rename the file from .jad to .txt and open it using a text editor. Inside it you can find the address (near
MIDlet-Jar-URL tag) where the JAR file resides. It will be simply a web URL most of the times but not always.
Copy the URL to a web browser in PC and download the JAR file. Then you have to edit the JAD file by
opening it with a text editor. Just replace the URL you copied with the name of the app along with extension
and save the file with .jad extension. Then copy both files to a folder in the memory card. Access the
filemanager in the BB and browse to that folder. Then click the JAD file and click install. It will install that
application.
Cod or COD files:
This is the native app file format of BB. All apps that have advanced features will have this format. An
application may consist of one or more COD files. You cannot install a Cod file directly. You will need a
description file to install it. These description files will have extensions .jad or .alx. Let's see how to handle
these files:

5. 1. To install an app with ALX file you have to use the BB Desktop Manager. Connect the BB to PC and open
the Desktop Manager. Then use the App Loader in to install the application.
(Select the ALX file inapp loader)
2. To install an app with JAD description file, copy the whole files to the memory card. Then access the file
manager in your BB to open the JAD file and click install/download.
So with JAD you can install an app without using a PC. One more thing to know is that it is possible to
manually write a JAD from ALX or vice-verse. But that is for only advanced users as it is a bit difficult. I will
consider writing a post about that in future.
That's all you need to know about installing blackberry application. Hopes this will help a lot of people who
are troubled by insufficient information from RIM regarding this topic. Please consider tweeting this post as
that will help a lot of people to find this information.