I've found a solution:
https://lists.ubuntu.com/archives/ubuntu-
users/2007-June/thread.html#117436
I did exactly as Cameron Hutchinson explained, and now it's working.
1. created /etc/udev/rules.d/10-local.rules with the following content:
BUS=="usb", SYSFS{serial}=="PalmSN12345678", KERNEL=="ttyUSB[13579]*",
SYMLINK="treo"
2. Did a "modprobe visor"
3. Pushed the sync button on Treo's USB cable
4. Clicked on the Backup button in JPilot
So it looks like it's a bug with USB. Also the "visor" kernel module is
not loading automatically.
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Can't sync Treo 650 with Jpilot / Ubuntu
https://bugs.launchpad.net/bugs/116885
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