If you hold Home+Enter+P on a TI-Nspire CAS+, you don't get a maintenance menu, no... the calculator just does immediatly remove the OS without prompting!
As this prototype based on the TI-Phoenix 1 is totally incompatible with later Nspire models, and as Texas Instruments has never published a CAS+ OS installation file, your calculator is now permanently bricked.
Without Texas Instruments help, we could rebuild a compatible OS installation file if we managed to dump the NAND ROM.
There were many attemps using the TI-Nspire Computer Link, and all of them failed... So if we have no further similar idea, we have to try something else.
Jimbauwens is trying the thing another way. Following the idea suggested by mikehill2003
, he has just tried the 1st hard-dumping of the TI-Nspire CAS+ with OS 1.0.554 I sent him.
The idea is to connect the NAND ROM to an xD card reader, as unlike other cards, xD cards are just raw NAND ROMs without any controller or interface.
Soldering those tiny pins was very hard and he even had to use a microscope!
But unfortunately, the computer stubornly states that there is no media in the xD reader.
Please cheer him up, as we might never be so close to dumping the CAS+ again...
Bigger photo available from the TI-Planet news:http://tiplanet.org/forum/viewtopic.php?f=43&t=9179