I have solved the problem with the help of the guys on IRC. In case anyone else has the same problem, here is what I did to fix it. Hold VOLUME UP while turning the player on. The kernal will then be restored. Turn the battery switch to OFF and then to ON. Now turn the player on and the OF will load giving you access to USB once again. Before copying the new bootloader remember to rename the FWIMG01.DAT to FWIMG01.DAT.ORIG as per the installation instructions so it can be restored if ever needed. Now copy the new bootloader to the device and Rockbox should load once again after you power off, flip the battery switch to off then on, and power on.