hi ,
to upgrade your Baystack switches , you have to get two files the image and the diagnostic files ( .img & .bin ) these files are available in nortel website >> customer services >> software dist >> baystack switches
after getting the files ;
use a tftp server to transfere the files to the switch
from main menu >> software download >>
configure the ip address of the tftp server ( where the files are )
>>in diagnostic file field , put the path for your .bin file
>>using space bar select "diagnostic file trans"fere"
>> enter
the switch should transfere the new diagnostic file , after that it will reboot ,
next , you have to upgrade the image
>> software download >> image file path >> select image >> enter .. after that switch reboots with new image ..
you may find these steps well explained in the nortel website under "Customer service Bullitins " ..> BPS switch
Regsrds,