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Author Topic: OS 3.0.2 downgrade now possible with DowngradeFix  (Read 14388 times)

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Offline JosJuice

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #15 on: June 16, 2011, 06:24:15 am »
A question: Does 3.0.2 allow downgrading to 3.0.1, or are all downgrades blocked?
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Offline critor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #16 on: June 16, 2011, 06:26:36 am »
You cannot downgrade from 3.0.2 to 3.0.1 without using the previous tricks.
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Offline critor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #17 on: June 16, 2011, 06:00:09 pm »
A little bug has been reported with DowngradeFix.
Check here:
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1188

Strangely, that bug was also present on the first Nleash versions.

Note that Nleash only worked on OSes 1.7 and 2.1.0.
With Downgradefix you don't need to have a specific OS installed - you only need the 1.4 Boot2.
« Last Edit: June 16, 2011, 06:04:08 pm by critor »
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Offline DJ Omnimaga

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #18 on: June 22, 2011, 06:18:47 pm »
Hmm weird. Hopefully it doesn't cause too much problems for downgrading.
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Offline ztrumpet

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #19 on: June 22, 2011, 06:45:10 pm »
Hmm, somehow I missed this.

Anyways, this is awesome!  Great job by whoever made this.  Excellent work. :D
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Offline critor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #20 on: July 10, 2011, 01:00:28 pm »
The french "OS 3.0.2 downgrade" tutorial is out.

If you're running OS 3.0.2 with Boot2 1.4, you just need to use DowngradeFix.


If not, you'll have to downgrade your Boot2 first in order to be able to use DowgradeFix, and this won't be as easy...


http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1245
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Offline Sebasu

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #21 on: July 22, 2011, 08:14:28 pm »
wow this is wonderful, works perfectly
If you can create a fake OS, able to handle ASM code then do not be long time before you can create a full OS and fully equipped with ndless, besides noting that not long to launch a ndless 3.0, very good job.
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Offline Munchor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #22 on: July 24, 2011, 08:30:37 am »
Quote from: Sebasu on July 22, 2011, 08:14:28 pm
wow this is wonderful, works perfectly
If you can create a fake OS, able to handle ASM code then do not be long time before you can create a full OS and fully equipped with ndless, besides noting that not long to launch a ndless 3.0, very good job.

Creating a full OS is pretty much impossible for now, as we don't know the RSA Algorithm yet :S
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Offline JosJuice

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #23 on: July 24, 2011, 08:34:16 am »
Quote from: ephan on July 24, 2011, 08:30:37 am
Creating a full OS is pretty much impossible for now, as we don't know the RSA Algorithm yet :S
We know the algorithm that the OS is signed with - it's the key that we don't know. (Or did you mean the algorithm to find the keys? It's mostly a matter of computing power.) Anyway, wouldn't OSLauncher work for custom OSes?
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Offline Lionel Debroux

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #24 on: July 24, 2011, 08:47:32 am »
OSLauncher does work for custom OS indeed, I released the (useless) DummyOS proof of concept alongside OSLauncher :)
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Offline JosJuice

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #25 on: July 24, 2011, 09:23:16 am »
What would be required for an OS to be compatible with existing Ndless programs? Do we have to provide an environment that's similar to Phoenix, or will the programs accept anything?
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Offline Lionel Debroux

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #26 on: July 24, 2011, 09:38:49 am »
Quote
What would be required for an OS to be compatible with existing Ndless programs? Do we have to provide an environment that's similar to Phoenix, or will the programs accept anything?
For full Ndless compatibility, lots of things are required: Ndless exports dozens of standard and less standard functions to user programs, and said functions have dependencies themselves.
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Offline Munchor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #27 on: July 24, 2011, 10:11:37 am »
Quote from: Lionel Debroux on July 24, 2011, 08:47:32 am
OSLauncher does work for custom OS indeed, I released the (useless) DummyOS proof of concept alongside OSLauncher :)

Can you please link? I never saw it O.O
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Offline Lionel Debroux

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #28 on: July 24, 2011, 10:20:27 am »
I can post a link, but the "OS" is completely useless, as I mentioned, so you're not missing much if you haven't seen it :D
DummyOS draws garbage on screen indefinitely, and polls the ESC key: if it's pressed, it reboots the calculator.

OSLauncher: http://www.ticalc.org/archives/files/fileinfo/437/43701.html
DummyOS: http://www.ticalc.org/archives/files/fileinfo/437/43702.html
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Offline Munchor

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Re: OS 3.0.2 downgrade now possible with DowngradeFix
« Reply #29 on: July 24, 2011, 10:21:03 am »
Thanks Lionel, is it possible to emulate it?
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