It really depends on what software was updated. Sometimes you just need to reboot the phone to get what was missing back. It can be hidden temporarily rather than gone.
However, if it is gone, there is no guaranty of getting it back. You can try the following though...
There are a few apps/programs out there that 'may' be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many others out there, so check around and see which you would rather try. There is also one called RECUVA, that I have heard is free, which you could try.
One important note though, most of these programs are not free. They...