Try this:
https://www.mobileread.com/forums/sho...4&postcount=23
Using oldupdate.zip (attached to that post):
- Extract and move all files/folders within to the root of your Kindle Drive. There are two items -- A folder called "update", and a file called "Update_oldupdate_install.bin"
- Put the desired update, err, "downdate" into the folder "update".
- Update your Kindle manually, from:
- Menu ==> Settings ==> Menu ==> Update Your Kindle