If you find a bug which results in the nspire doing weird things (crashing, displaying crap) or something similiar, report it, please
The serial port is nice to have and absolutely necessary to rescue a calculator with broken diags or boot2 which can both (?) be deleted with keyboard commands. So there's almost no chance in TI removing the uart
The possibility to upgrade the OS means they have to expose the binary to the public and it is always possible to decrypt it.
Hardest thing is to find bugs in the disassembled code and exploit them.

No, I meant GNA unrar. Ok, then the site was unbelievably old to state that it supports the most recent RAR format..

The boot1 version is the same and it doesn't make sense to me to include drivers in boot1 which aren't included in boot2 and vice versa.
But then it's TI.

Very hard, BGA parts only.

if you use cat or echo to the device it ail reboot as far as i know

What device reboots?

BTW: Compiling now

Harder than software ones. But don't even think about the nspire having exploitable hardware..

I rather mean something like holding esc on startup prevents the CPU from resetting its registers and PC.
That'd be a bug that can't be worked around using software.