Hardware reference guide

7535 Hardware Reference Guide 59
Chapter 5: Reinstalling The OS
USB Download
Equipment Needed
Note: You may need to reconfigure any changes done to the system configura-
tion through the Control Panel. The registry will be set to default values if
the new OS determines that the previously-existing registry values are not
compatible.
5.3 USB Download
This section explains how to replace the operating-system software image in a 7535
through a USB cable.
5.3.1 Equipment Needed
Replacing the software image requires the following items:
• The new software image. The software image can be obtained from Psion
Teklogix. It has the part number 1000428x (where x is the version).
• A PC with an available USB Type-A connection
• A 7535 Portable Docking Module (PDM), with a USB Type-B port.
• A USB A/B cable.
5.3.2 Upgrading The Software Image
The software image on a 7535 is upgraded by rebooting the device into the BooSt
boot loader, copying the OS image file to the 7535, then rebooting the device. The
7535’s boot loader loads and runs the new OS image file.
When the 7535 is booted into BooSt and connected to a PC using a USB cable, a
drive labeled “Removable Disk” appears on the PC. This drive contains the 7535
software image. To upgrade the software image simply copy the new software
image (which must be named 753xos.img) to this drive.
Important: Before connecting a 7535 to your PC using USB, you must update
the USB .inf file on your PC. This can be done by running the USB
Setup program included on the SDK CD.
The USB Setup program, with part number 1000997x, can also be
downloaded from the Psion Teklogix developers’ web site at
http://www.psionteklogix.com/developers/ .
The following steps explain the process for upgrading the software image in a 7535
connected through USB using a Portable Docking Module: