unable to change boot2 diag mode in nsandmgr

[shirl001]

I have version A Nspire CX and trying to load 3.2_3.6 switchpack. I followed the tutorial but got problem trying to get the Boot2 diag mode. When I do 5 then 8 to switch the boot mode to boot2 diag, i get error " boot data invalid: reset and try again. press a key". how do I fix this to load Nlauncher?
Thanks,
Shirley

[critor]

The only reason I can see Boot Data is invalid is if you did erase it completely with 7.

Press reset on the back and it will be automatically recreated.
Then run nsNandMgr again, press 5 8 and nothing else.

[shirl001]

I got into maintenance mode and option 4 to delete everything and reinstall 3.6 OS. I then followed the tutorial and eveything works.
Thanks,