posted by ftw666:
You missed this step,this is from webOS wiki
Type 'webos-kernels-testing' (without the quotes, and using lower case letters and hyphens only) in the NAME field of the NEW FEED section of the Manage Feeds screen accessible from the Preware application menu. If you make any error in this feed name, the URL below will not be replaced by the real URL when the device is rebooted, and you will not get access to the feeds. MAKE SURE YOU GET THE FEED NAME CORRECT!
Put http://preware.is.awesome.com/ in the URL field. Note that this is not a real URL - it is a placeholder only. Again, you need to get the feed name correct for the real URL to be replaced correctly when the device is rebooted.
Leave the IS COMPRESSED toggled on.
Hit "Add Feed" and read the disclaimer carefully. Yes, the things you might find in kernel testing feeds are likely to completely wipe your device without warning. Hit the Ok button only if you are prepared to lose all your data and destroy your device without any regrets or complaints.
Immediately reboot the device by simultaneously pressing the Opt, Sym and R keys. If you don't reboot the device, or if you only do a Luna Restart instead of a Device Reboot, then placeholder URL will not be replaced by the real URL and you will not get access to the feeds. MAKE SURE YOU REBOOT THE DEVICE!
Wait for the device to boot. If you got the feed name correct, the placeholder URL will be replaced by the real feed URL automatically.
Open Preware, and hit Update Feeds. Make sure you have a working network connection for this.
Preware will repair the URL field automatically when the device boots. Did I mention that you have to get the feed name precisely correct for this to happen? MAKE SURE YOU GET THE FEED NAME CORRECT AND REBOOT THE DEVICE!
You must be running Preware 1.1.4 or later for this to work (yes, this has been possible for quite some time).