changing the AIX kernel to 32 bit from 64 bit

To change the kernel back to 32-bit, enter the following commands:

ln -sf /usr/lib/boot/unix_mp /unix
ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
lslv -m hd5
bosboot -ad /dev/ipldevice
shutdown -Fr

to refer more about the determining the AIX platform is 32 bit or 64 bit,click here