Originally Posted by NiLuJe
Don't try to force a custom update by rebooting your Kindle. You should *always* install custom hacks via the Settings page. If the 'Update Your Kindle' link is greyed out, it's because you uploaded the wrong binfile for your device. Don't try to force an install by rebooting. It'll, at best, fail, and at worst, force you to start your Kindle in recovery mode to delete the offending update.