I wonder if it is possible to reinstall the OS if every single bit of writable information has been reset o.O

It would be great if the tool could be included in the future. I remember some people couldn't figure out how to use Rabbitsign and Wabbitsign. As for Wappsign I heard it sometimes gives bad signatures so I don't know if we can rely on it.

I don't think there can ever be a situation when you cannot install an OS, unless you explicitly used BrandonW's special brick code.

By the way, I should mention that I found some stupid bugs in the Axe app compiling that I'm in the process of fixing, it should make them finally signable on-calc without needing to flash a sector in the next version.

That's good to hear.  By the way, I believe that you can simply end the app with the bytes 02 2D 40, and stop there, leaving the rest of the page blank.  (I originally thought it might be necessary to include the "f" value - the extra 1-2 bytes that come after the signature proper - but this seems not to be the case.)  You can still send the unsigned app to a PC, or at least you can using TiLP - somebody should probably check that TI-Connect doesn't have a problem with it.

I'm not sure if I would want to merge application signing into the Parser, but I would definitely like to include it in the tools section of the Axe suite with your permission once I get it working.

It's free software.  All I ask is that you include the source code for the tool, or link to it.

Also, I really don't want to mess with the certificate page.  But if I understand correctly, couldn't that issue be averted by sending the app to the computer/another calculator and then sending it back?  It seems like there would have to be some kind of mechanism to prevent that or the whole trial-run business would be pointless.

I can understand your hesitation.  In this case, I'm pretty confident that the example code I gave will do the right thing, or at least won't break anything too badly.  Otherwise I wouldn't recommend it.

I don't really know much about how the limited-trial system is supposed to work; I've never seen an app that used it.

I wonder why TI just won't remove it altogether? They don't even sell apps anymore anyway.

It would break compatibility. There are still a few non-TI apps that use this system, actually.

I remember seeing a math app for sale on some website, but I'm don't remember a lot of it... Other than that you had to download the trial app to get a code you had to enter on the website before you could purchase the app. The normal calc ID didn't work.

Its weird because i have a Portal App thats been run many more times than that o.O

I remember seeing a math app for sale on some website, but I'm don't remember a lot of it... Other than that you had to download the trial app to get a code you had to enter on the website before you could purchase the app. The normal calc ID didn't work.

Weird, maybe they still sell apps, but only very few of them. I remember they sold many, back then, such as Periodic. Some apps costed around $20.

As for Axe apps being deleted after 16 runs, it seems like when you compile an app on-calc with Axe, the TI-OS thinks it's an actual trial app.