Here's a quick way to patch N5 firmware to work on the R4. 1. Download the latest version of the N5 firmware. 2. Load _DS_MENU.DAT into your favorite hex editor, and patch offset (DECimal 1664, HEX 680) from 46 to 4F. 3. Encrypt _DS_MENU.DAT with r4crypt. That's it. Now, I'm not sure if _AX_MENU.DAT is in any way loaded, I suspect that it may be the underlying bootloader that may somehow patch _AX_MENU.DAT to the firmware, I'm as of yet unsure of how it is designed. Here is a RAR that is prepatched and precrypted. It is byte-for-byte identical to the official N5 1.25 firmware with the exception of the one-byte modification above, and recrypting the menu. http://www.divshare.com/download/5889203-cb7 Disclaimer: I am not promising that this will give you any additional features or functionality, this is simply a proof of concept. I have not tested it yet to see if there is any difference, as I'm still not sure which ROMs work on N5 but not R4, nor do I currently have any roms to test with. But I do have a spare R4 kicking around, and I was bored, so I did this.