QUOTE(eddydo @ Jul 11 2012, 06:23 PM)
can explain what you said just now? that external memory la internal something something de

And ah,where do nandroid save the backup?
EDIT: and i found a 512mb memory card, enough?

haha!
do this bro.
1. clear up some space. if you said just now you could get 4GB worth of space, then it's enough for a nandroid backup, but if CWM couldnt detect the space for your huge apps, then it would only backup ur working current ROM.
2. boot into recovery, do the backup. by backup in CWM recovery, it means Nandroid backup. Cx the status after the backup is done, whether the apps are backed up or not via the CWM itself or boot normally into ur ROM, open ur TB and hit the Menu button, choose Extract from Nandroid Backup and see whether it got the list of ur apps.
3. put the new ROM in ur internal SD. Make sure it has some space left, preferably 2x the space of the ROM for extracting purposes. Too low a size, it's either you'll get an error of not having enough space or the flashing of the new ROM would take longer. Make sure you follow the dev's way of flashing; clear up Dalvik cache, bat stat etc. Cx out the dev page for more info.
4. If it flashes mean youre all right. Wait till it finishes. Boot up and test everything in the new ROM.
5. If everything works fine in the new ROM, delete the ROM .zip file and try to restore some of ur apps, based on ur space available left in ur internal.
No need ext SD oso is ok, but it would be safer to have the ext SD card.