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Offline Michael_Lee

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Non-validating OS - why?
« on: October 28, 2010, 01:54:37 pm »
Today, at school, I wanted to see what would happen if I tried to transfer an OS from one calculator to another, so I tried sending OS 2.53MP to my friend's calculator (he had the standard OS 2.43).
I managed to send the entire OS over, but it wouldn't validate and I ended deleting my friend's OS altogether. 
I tried again two more times unsuccessfully, and resorted to sending OS 2.43 from a third person's calculator (which worked first try, and interestingly, everything in archive was intact!).

So my question is, why didn't my OS validate/work?
Is it possible that my monkeying around with Axe (especially when I make mistakes and write data to oddball places) might have somehow corrupted my OS?  Or is 2.53MP just non-cooperative in general?
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ASHBAD_ALVIN

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Re: Non-validating OS - why?
« Reply #1 on: October 28, 2010, 02:00:06 pm »
(this is a complete guess -- beware)

That axe stuff probably wouldn't have affected it that much, but I've heard that 2.53 doesn't send very well between calcs and even between calc and computer.  Plus, 2.43 is much better, because 2.53 is pretty buggy and doesn't let certain ASM programs run.  So I would get him to send his os to yours :3  (that's my opinion)\
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Offline thepenguin77

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Re: Non-validating OS - why?
« Reply #2 on: October 28, 2010, 02:53:06 pm »
Those OS won't validate because something changed it. That is Ti's way of keeping their OS's legitimate.

Possible things that would have changed it:
-OS patches (well duh, but this includes any type of fix)
-zStart (Just uninstall it to fix the validation)

And while it is slightly possible that an ASM program could have changed it, accidental changes usually result in complete OS failure.
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Offline qazz42

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Re: Non-validating OS - why?
« Reply #3 on: October 28, 2010, 03:34:35 pm »
I want to know is why you would give him MP in the first place O_O

if you are using brandon's patched one tho, that could be why
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Offline Michael_Lee

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Re: Non-validating OS - why?
« Reply #4 on: October 28, 2010, 06:10:38 pm »
Quote from: qazz42 on October 28, 2010, 03:34:35 pm
I want to know is why you would give him MP in the first place O_O

if you are using brandon's patched one tho, that could be why

Reasons:
1) My friend doesn't know how to program, and probably will never try to learn how.  He also is unfamiliar with how calculators work, so he's unlikely to download games off of the internet.  Things like the pretty sigma notation, mathprint, and better log stuff would be useful for him because that's pretty much exactly what we're covering in math right now.
2) Simple curiosity.  I was in chemistry, and my teacher talks extremely slowly.  I was extremely bored, and didn't want to risk my calculator so I just messed with his.
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Offline jnesselr

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Re: Non-validating OS - why?
« Reply #5 on: October 28, 2010, 06:13:45 pm »
It would be interesting if you could send your os to your computer and then to me, please.  Thank you.
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Offline yunhua98

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Re: Non-validating OS - why?
« Reply #6 on: October 28, 2010, 06:13:48 pm »
Yeah, if your using BrandonW's modified version, TI's little code stuff won't let you send OS?  :(

silly TI...
I would just get the calcs from the grade lower than you, cause they probably have 2.53MP preinstalled.  ;)
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Offline DrDnar

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Re: Non-validating OS - why?
« Reply #7 on: October 28, 2010, 06:16:19 pm »
BrandonW wrote a program that will resign the OS on-calc. It takes like 20 minutes to run, though.
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Offline Michael_Lee

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Re: Non-validating OS - why?
« Reply #8 on: October 28, 2010, 06:21:38 pm »
Quote from: graphmastur on October 28, 2010, 06:13:45 pm
It would be interesting if you could send your os to your computer and then to me, please.  Thank you.

Mkay - how do I do that?  I think I can use wabbitemu to pull my ROM, but I'm not sure how I could send my OS to my computer.

btw - I'm not using BrandonW's patched OS, nor am I using anything like zStart.
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Offline yunhua98

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Re: Non-validating OS - why?
« Reply #9 on: October 28, 2010, 06:23:48 pm »
I blame TI.

:P
I think you have to use TI-Device Explorer, I'm not sure though.  ???
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Offline DJ Omnimaga

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Re: Non-validating OS - why?
« Reply #10 on: October 28, 2010, 08:00:19 pm »
Strange, I have never heard about invalidated OSes before. Could it be something to do with a broken certificate?

Also, does installing an OS patch automatically invalidates the OS?
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Offline FloppusMaximus

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Re: Non-validating OS - why?
« Reply #11 on: October 28, 2010, 08:31:13 pm »
Yes, any OS patch will invalidate the OS (well, unless you also set a new OS signature.)

Another thing to watch out for is that Brandon's unlocking method may overwrite the byte at 6AAAh on page 2.
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ASHBAD_ALVIN

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Re: Non-validating OS - why?
« Reply #12 on: October 28, 2010, 08:33:24 pm »
so maybe that's what was doing it?

nice to see you around, floppus ;)
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Offline DJ Omnimaga

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Re: Non-validating OS - why?
« Reply #13 on: October 28, 2010, 08:34:32 pm »
Ah, ok then. And what is the byte located at 6AAAh on page 2?
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Offline FinaleTI

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Re: Non-validating OS - why?
« Reply #14 on: October 28, 2010, 08:49:55 pm »
This topic could be of help.
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