If Sony does an update at all, it does one only. It pretty much abandons the old models when the new ones come out.
I responded to your private message - I do have copies of the old drivers and a saved copy of the firmware updater that took the 500 to 1.0.03.07170.
I also found copies of the PDF user guide and quick start guide, as well as the original "CONNECT" software (for anyone who feels particularly masochistic
)
Finally, I found versions 1 and 2 of the original PRS "customizer" that worked with both the 500 and 505. (Hacks developed by users here). You'd have to search around on this site for instructions though, it doesn't look like I actually saved those!
The zip does include the following readme file:
Quote:
PRS-500 and PRS-505 (Sony Reader) universal flasher
v 2.0 2008/07/26 by igorsk
* Description
This set of scripts allows to flash a custom image or replace any files inside
the /opt directory of the Reader filesystem using just a flash card. The /opt
directory contains the main Reader UI and supporting files.
Possible uses include:
1) rolling back to an older firmware version
2) customizing the UI look and behavior
3) replacing/adding built-in fonts
As an example, provided xml files add a configurable clock display in the
status bar of the navigation menus and book reader.
* Usage
1) Extract the zip onto a flash card, keeping the directory structure. It's
best to use a card with not many files on it so that Reader can scan it quickly.
N.B. readme.txt should be in the root of the card, not in any subdirectory!
2) Insert the card in Reader.
3) Wait until the "Run Script" screen appears.
4) Press 5. Wait for the success message (the process will take about one to
two minutes).
5) Press 6. Wait for the success message.
6) Press 9 to reboot.
7) Extract the card.
* Using the clock display
To set the correct time on PRS-500, you need to connect it to
the PC and run the eBook Library software after each reset.
It should also be possible with libprs500 or Calibre.
For PRS-505, you can set the time in Settings or connect to PC with
the eBook Library software running.
To set up 12/24 hour format or turn off the clock, use the Settings-About
screen and the button 0 (check the status bar).
* Other uses
Put any files you want to add/replace in /opt to the /files
directory. E.g. if you want to replace the stock fonts, put the following
files in the /files.XXXX/opt/sony/ebook/FONT directory:
tt0003m_.ttf for Swiss721 BT Roman
tt0011m_.ttf for Dutch801 Rm BT Roman
tt0419m_.ttf for Courier10 BT Roman
You should edit yout .ttf files to have these exact font names, as most of
the LRFs use them.
If you have a ready-made /opt image you want to flash (e.g. a stock Sony firmware),
put it as a new_opt.img in the root of the card and use option 4 then 6.
You can run any custom shell script by editing script.sh in the card's root
and using option 3. Please note that the script needs to have Unix endlines
to run properly.
* Version history
2007/05/11 Initial release
2007/05/16 Version 1.1
Added support for MemoryStick cards
Added a sample shell script
2007/05/17 Version 1.2
Support for firmware version 1.0.02.01300
2008/07/26 Version 2.0
Support for PRS-505
* Credits
Shell scripts by Corwin
Clock display by Shade
PRS-505 support by porkupan
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I'm pretty sure I installed this so I could see the clock and so I could have custom icons, if I remember correctly. The icons might have been a higher version Sony, I just can't remember any more.
ADDED: I meant to say: I'm adding comments here, even though I responded to your Private Message, in case anyone else wants any of these as well.