PRS-650 Downgrading firmware

Ivy · 04-14-2011, 05:25 PM

Hi everybody,

I would like to delete OS on my 650 and install an older version. For some reason, the new OS freezes on me quite often and it's annoying. I have not been able to find a way to do it, nor a place to download the old OS...

I would appreciate any help or links you throw my way. I am using Mac OS X 10.6.7, but if I have no choice I can switch to Windows 7 to do this.

Thanks in advance,

Ivy

kartu · 04-15-2011, 04:05 AM

Not sure about mac OS, but on windows all Sony installers are basically zip archives.
If you rename exe to .zip, you can unpack it. Then there is file (dont remember exact name, something like prsver.dat) in some of the subfolders, that contains installers version. You can edit it with notepad or any other text editor. Set value to something higher than what you have on your reader, it should do the trick.

Ivy · 04-15-2011, 04:16 AM

Hi kartu

One of the reasons I want to downgrade is so that I can install your PRS+

I will see if your tip does it, thanks!

kartu · 04-15-2011, 04:24 AM

Ivy,

next release might be only a couple of weeks away, in case it changes anything for you.

Ivy · 04-15-2011, 04:27 AM

Well, it hasn't messed with me since.... yesterday night

I reinstalled everything (with the newest version again, since I didn't know how to downgrade it) and if that fixes my freezing problem, I'll just wait a bit. Thanks for the heads-up.

04-14-2011, 05:25 PM	#1
Ivy Sometimes I purr. Posts: 252 Karma: 5979384 Join Date: Dec 2010 Location: Texas, USA Device: Kindle	Downgrading firmware Hi everybody, I would like to delete OS on my 650 and install an older version. For some reason, the new OS freezes on me quite often and it's annoying. I have not been able to find a way to do it, nor a place to download the old OS... I would appreciate any help or links you throw my way. I am using Mac OS X 10.6.7, but if I have no choice I can switch to Windows 7 to do this. Thanks in advance, Ivy

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04-15-2011, 04:05 AM	#2
kartu PRS+ author Posts: 1,637 Karma: 2446233 Join Date: Dec 2007 Device: Sony PRS-300, 505, 600, 650, 950	Not sure about mac OS, but on windows all Sony installers are basically zip archives. If you rename exe to .zip, you can unpack it. Then there is file (dont remember exact name, something like prsver.dat) in some of the subfolders, that contains installers version. You can edit it with notepad or any other text editor. Set value to something higher than what you have on your reader, it should do the trick.

04-15-2011, 04:16 AM	#3
Ivy Sometimes I purr. Posts: 252 Karma: 5979384 Join Date: Dec 2010 Location: Texas, USA Device: Kindle	Hi kartu One of the reasons I want to downgrade is so that I can install your PRS+ I will see if your tip does it, thanks!

04-15-2011, 04:24 AM	#4
kartu PRS+ author Posts: 1,637 Karma: 2446233 Join Date: Dec 2007 Device: Sony PRS-300, 505, 600, 650, 950	Ivy, next release might be only a couple of weeks away, in case it changes anything for you.

04-15-2011, 04:27 AM	#5
Ivy Sometimes I purr. Posts: 252 Karma: 5979384 Join Date: Dec 2010 Location: Texas, USA Device: Kindle	Well, it hasn't messed with me since.... yesterday night I reinstalled everything (with the newest version again, since I didn't know how to downgrade it) and if that fixes my freezing problem, I'll just wait a bit. Thanks for the heads-up.

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