: Refers to the R4 Revolution for DS , a popular flashcart used to run ROMs and homebrew on Nintendo DS systems.
How to Install and Troubleshooting R4 Firmware Updates (GF040522-KKS Edition) GF040522-KKS-R4.part05.rar
: This indicates it is the fifth part of a multi-part RAR archive . You need all previous parts (part01, part02, etc.) in the same folder to extract the contents successfully. Draft Blog Post Outline : Refers to the R4 Revolution for DS