The process is a little complicated and involves switching out a few lib files. So if you’re not confident with fiddling with the framework of the device, make sure you do some homework and get comfortable with it before attempting as messing up can damage your device. Be sure, as always, to perform a full back up just in case.
The process is otherwise not complicated, as Azdian says:
*Download Madmack RTL Patacher HERE, then extract the files, you will see some subfolders and files what you need to remember is input and output subfolders and command.exe for later use.
*Go to your kindle open Root Explorer [or any app can do the same] and copy these files from your kindle to your pc
*move these files to input subfolder , and then run commands.exe DO NOT close the black cmd screens that will pop up, wait till its finish, once its done you will find these files in the output subfolder
So if you’re of the Arabic, Persian, Hebrew, etc persuasion and want the RTL support on your Kindle Fire, you can find the download links, the complete instructions and further information in its original thread._________