This is the easiest program to transfer files from you linux desktop to the psion, pretty much plug-n-play.
Zipped source and binary files can now be downloaded from the PsiLinux web page Bootloaders
The official ARLO page is located at Peter van Sebille's webpage
The ARLO HOWTO is HERE
Psion 5MX's apparently have a common failure with the flexible cable connecting the unit to the LCD. Typical symptoms are a screenful of horizontal lines. If this cable fails there is often nothing to do but get a new psion (try ebay.com?); replacement cables seem to be impossible to find. Some hints on how to repair your broken psion, and perhaps even some hints at preventive maintenance can be found at The PDA Graveyard. WARNING: The photos there are not for the faint of heart; rated R for gore and violence.