Undo a firmware update?

I have a Treo 700wx with Sprint. After backing up my contacts with a Sprite Backup trial, I updated my firmware to 1.15. Then I had to reset my phone. Afterwards I found out that one of the limitation of the trial is that it won't restore after a software update.
How can I undo the update, or downgrade to 1.14?
Post relates to: Palm m500

I believe that this is not possible. 
What you can do is to reinstall the whole device with 1.14. 

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    Just to update.
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    2) I shut down and swapped some different RAM, then reset the SMC again and booted without battery. This time I got the boot chime and the Macbook booted to the Apple logo screen and spinning cogwheel. After about 2 minutes, the cogwheel stopped spinning, as if to boot to the desktop, but then the display went black. The front light started to pulse after about 10 seconds, and the Macbook appeared to be in Sleep.
    3) I woke the Macbook from sleep by hitting a few keys and this time it went to the desktop. This is the first time it's gone to the desktop since the problem started.
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    At this point, I can now always get to the desktop, but the display goes black after about 10 seconds. I have just enough time to press a few keys and the Macbook does respond.
    4) I shut down and reinserted the battery. Here's where new problems show up.
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    If you don’t hear beeps, but the sleep indicator light flashes five times when you start it up or wake it from sleep, its battery may need service. Take the battery to an Apple Authorized Service Provider, such as an Apple Retail Store.
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    You can continue using your computer before you service the battery. Use a different battery, or connect the computer’s power adapter and plug it into a power source.
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    BUT, the battery is not defective, as it works okay in another Macbook.
    I should also point out that the problem with the 5 indicator light flashes or with the battery did not exist before the 10.6.8 and the Firmware 1.4 updates.
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