These are all img files that can be used to create a bootable mSD with the latest ClockWorkRecovery. The *.rar files are just like zips and should be extracted to *.img before attempting to burn them. http://mrm3.net/nook-color-updated-clockwork-recovery-bootable-sd/ (link above contains files that continue to be updated) Version 188.8.131.52 files are also here http://www.mediafire.com/?ql694b9h0w3b82f Instructions: 1. Download one of the bootable files above. 2. Extract it to a .img file using a program such as winrar or 7zip. 3. Use win32diskimager to burn the image to a blank SD card. 4. Place any other zip files on the SD card wich you may use for flashing (ROMs, kernels, stock images, etc.) 5. Inter your bootable CWR SD car into a powered off Nook and then power on to boot into recovery. 6. After following proper flashing procedures for your zip files, unmount the card and remove it before rebooting.