So my trick doesn't work on CX CAS's.. my friend taught me it for opening Gamecubes, Yamashita. Well it's old but gold, but all it takes is creating a deeper crevice for it to be useless.

A tri-wing works on these, as will an appropriately sized philips head. But really, get a Torx 6.

good call, Yamashita! The Clutch screws can be opened with a firmly and meticulously placed flathead, as well.

TI has good reasons for locking it down, and I understand the feeling, though I personally love TI.
I have fixed many a broken wii and gamecube

THIS WAS INVENTED BY ME! TAKE THAT EHOW!!

So my trick doesn't work on CX CAS's.. my friend taught me it for opening Gamecubes, Yamashita. Well it's old but gold, but all it takes is creating a deeper crevice for it to be useless.

A tri-wing works on these, as will an appropriately sized philips head. But really, get a Torx 6.

So you lie and take credit for things that you didn't come up with?

_Nicco_  , did you succeed to remove the Clutch screw (near the battery) ?
I bet that theses are clutch but I'm not sure, they are so tiny ...

I'll try to remove the clutch screws after my homework gets done. 
Thanks.

After those screws should the top come right off?  Also do the clutch screws need to be put back in?

I'll try to remove the clutch screws after my homework gets done.  
Thanks.

After those screws should the top come right off?  Also do the clutch screws need to be put back in?

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Oh yeah !!!
I suceed to remove the clutch screws with a 1.2 mm flat screwdriver. It's was so easy with the right tool

Maybe there are hidden screws under pads ... I will see that later ...

edit :
Okay that's it ! You have two more clutch screws under the top pads. Once you have removed them, push the battery area to remove the motherboard part

I'll do it in one month
Now, I have a ton of homework to do ^^

One thing sholud be told... If you opens your CX/CAS with very small screwdriver, be aware that 2 pieces at reset hole don't get lost. A very small black round plastic with small pin has to sit in the reset hole with pin pointing to hole and a small grey rubber button has to be placed on it, the inner side with black conductive rubber pointing to small golden contacts at the board (and if it's adhering at the board, take it to a safe place, it may fall down by moving the Nspire board). By opening the Nspire both will fall out, when the back is hold upside. So look that the upper part with keys is upside and after opening, look for both pieces. They have a weight close to 0 and you know, such pieces can jump over incredible distances... So better to do this all on a wide table. When putting the Nspire together, replacing of the 2 parts is tricky. Put the black piece at his place and and put the grey button in right way on it, as I told before. Use a forceps, with fingers it's to difficult. Be careful, make not to much vibration by mounting back (of course laying at downside), otherwise the both pieces will change their position. When all seems right, try a reset before turning all screws in :-). Sorry about my very simple english.