A little advice
When a firm that owes you money goes titsup, there are several possible positions you can find yourself in.
The first and most important thing to understand is that the liquidators have the sole objective of keeping the banks happy. This is the most important business relationship in their world and you aren't even on the same planet.
If you're in the position where they want/need you to do something for them, they may well say something along the lines of "if you help out here, we will help you get more of what you're owed".
This is what the late great Guy Kewney called an "industry standard lie".
There are simple rules for who gets which money in what order, the beancounters have very little discretion and as above, their algorithm is to draw in as much money as they can for the bank and then stop.
These people are *obliged* by law and their management to shaft you.
Typically they will go for a "pre-pack", basically they may well have already set up a buyer for some fragment of the business that is viable, so as to get the last few quid for the banks, do not feel under any obligation to help the successor outfit unless it has a clear, contractual (in writing) payback for you.
That means if they want something from you, such as help sorting out the mess, then this must be done on a separate chargeable basis to the bad debts you have incurred.
Of course this is different to your relationship with the client, it's not their fault and of course they are the most obvious source of future revenue, so you need to start that discussion soon.