This fork is a command line wrapper for https://github.com/Ansuel/Decrypt_RBI_Firmware_Utility.

Download the latest decrypt-rbi.jar release file and then run it by passing the path to the RBI file as the only parameter.

java -jar decrypt-rbi.jar path_to_file.rbi

This will decrypt the RBI file and create the new decrypted file in the same directory with an extension of .bin.

You can then extract the filesystem from the .bin file with a utility such as p7zip. e.g.

/usr/bin/7z x -o'directory_name' 'decrypted_rbi_file.bin'

If you are using an Oracle Java-8 JRE, you need to exclude the standard JavaFX libraries. e.g.

java -Djava.ext.dirs= -jar decrypt-rbi.jar path_to_file.rbi