Thanks.
Do you have amilinux?
so, the failur in operation of your IP STB is due to an unsuccessful upgrade, YES?
so I should say that you may have difficult time correcting the IP STB.
Now, open the cover of IP STB and prepare a standard serial cable.
Aminet has a debug interface ( I have done all of these myself ) this is a serial debug interface, if you connect it to the serial port of your pc you will be able to connect to aminet using Hyper Terminal and you will be able to see the main linux operating system running on aminet.
you should login as root, now, there is a folder in the linux folders of aminet, which contains the main files needed for upgrade operation. as far as i remember this was the bin directory.
There is a file in this directory which indicates if the upgrade operation has done successfully, or if it should begin from begining or if it is in the middle of the upgrade. Now you should set the proper value in this file to point to aminet that the entire upgrade procedure should be begun from the begining.
Take care of your serial cable, it should be a 3.3 volt one otherwise you will burn aminet.
Good luck.