This method is simple because you do not require JARBOOM or ZNTXHAN. All you need is Xplore,class editor, and zip manager...
These apps install easily even on an unhacked device
Download class editor HERE
Step1=locate the java file you wish to mod, press 5 then mark all the files and extract them by pressing 4 to an empty folder on you xplore
Step2=go to the folder you extracted the files into open "META-INF" folder you'll see "MANIFEST.MF" press 8 to edit it, here is where you'll give a name to your modded app midlet name,vendor, URL,confirmation etc after editing, save and exit
Step3=if you wish to change the app's icon, u can do so by choosing a pic from your phone. resize the pic by 50-50 then rename it to the same name and format on the java app you're modding bears exit xplore
Step4=this stage is for advance use. Open ur class editor locate the folder you moved the java app files into, you'll see the classes just edit and change whatever you like e.g if you're modding UC BROWSER just edit "webclient.class" then save and exit
Step5=go to your zip manager open it and create a new archive, give it a name but still leave the extension in .ZIP format after creating the archive, press options "add to archive" locate the modding folder where all the extracted java app files are, mark all then copy to the zip archive. Press back. Done
Step6=the final stage, go to your xplore, locate the zip file you created. Just rename it by removing the .zip extension and adding .jar
Your modded jar file is ready! Install and enjoy
S40 tutorial coming soon