A full reflash isn't necessary, there's no need to waste your time restoring apps
On windows:
flasher-3.5.exe -F RX-51_2009SE_3.2010.02-8_PR_COMBINED_MR0_ARM.bin -u
Linux:
sudo flasher-3.5 -F RX-51_2009SE_3.2010.02-8_PR_COMBINED_MR0_ARM.bin -u
After it finishes unpacking the image type
flasher-3.5 -k zImage -f -R
Easiest way is to place the image in the same dir of the flasher and use the command as it is. Remember to change the filename of the image to whatever file you're using