If there are Disk Uploads that have not completed (i.e: currently Paused or 
with Error) and were not canceled the upgrade will fail.This is due to a 
foreign key being added on 4.2.5, relating image_transfers table to 
command_entities table.

When the roll-back to the previous RHV-M version finishes, open the 
Administration Portal and navigate to Storage -> Disks.

Browse all disks looking for disks with status different than OK, such as 
Paused by System. Right click and cancel/remove these failed or paused uploads, 
then try the upgrade again.
If it fails then share your observations with us, so we need to do some manual 
changes in database.


Vaibhav Pagar
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