It is a bit tricky first you need to install 1.23 if you do not already have it.....
Then go download tokenwriter and when you start it type this in :
write crnm
then hit enter......
THen backup and do a hard reset then run the 1.28 update installer from PalmOne.com
You can get the 1.23 at this link.....
http://home.austin.rr.com/viole