I was going to process step two for this work around for you, until Apple support data brought it to my attention that what I was about to do would not work.
The reason it would not work is because your Home folder, due to being set with FileVault protections is currently encrypted
and whether the Master password XXXXX XXXXX by not authenticating like it should, the home folder unfortunately will not be decrypted without the Master password XXXXX
This changes things dramatically, because as a Mac tech communicating with you via email, I am only as capable as the tools I can provide you via technical advice and links to helpful websites.
However, at this point, especially with this new information from Apple Inc. directly,
this is looking more to be a hands-on technical issue.
This means that it would be advisable for you to actually arrange to take this unit in to the Genius bar of your local Apple Store and have a Mac Specialist use their available tools to see if they can fix this for you.
I have attempted as much as I could from my side here, but if I were there working on your Mac in person ,my next logical step would be to open your Mac and from the inside, working with select removable hardware, attempt to isolate the issue to potentially erase the filevault function (if possible without risk to the intergrity of your Mac) or use a specialized software to correct the password XXXXX issue.
BotXXXXX XXXXXne, in a effort to get your Home Folder back via login access, you are going to have to put this unit in the hands of a qualified Apple service center. (see links below)
Apple on a number of their articles regarding the Master password XXXXX FileVault have noted that if the password XXXXX get through, the Home folder remains locked and encrypted and unfortunately will be lost.
Although I completely understand what they have listed in the techinical articles regarding master filevault password XXXXX there are still 3rd-Party (Non Apple, but Mac friendly that is) resources that may be used in a certifed service center, to work and resolve this authentication issue.Link:Apple Retail Store
-( Store locator for Apple store and Genius Bar in your region)Apple Service Provider
(Independent authorized Apple service centers)
I want so much to do more, but as noted above, this has now become an issue that is beyond email correspondence.
If anything , I hope this later recommendation is one you will follow, to finally get some technical hands on this problem. I do thank you very much, for allowing me the pleasure to assist you as far as I could and to let you know I will still be glad to answer any further questions you have regarding this subject, my current answer or any other info you may need.
Thanks again and best fortune on this issue. Please feel free to reply back anytime.