You would, could and should assume that a device created, assembled and soled by one manufacturer, think Tesla, Mac, KONE-elevators etc would be a piece of cake to update with latest firmware, if it’s even have to be done manually 2021.
But for the QNAP NAS Model TS-231P2 it turned out to be a tiny bit of challenge since at some point in time or to be more exact the 20190918 they had a small bug released in the first 4.4 build the 184.108.40.2064 build, but the day after they released a fix for it being the 4.3 version:
220.127.116.110 build 20190919 2019-09-19
Unfortunately for me that was not clearly mentioned that the only firmware upgrade I could do was to the 18.104.22.1680 build and not any of the newer builds and there were a lot of them since I had patched last time!
After I had got the 22.214.171.1240 successfully installed I could go with the latest Firmware available.
So there it was… Done for the moment!
Seems like they now support automatic patching and re-boot which I suggest you enable (can I turn of the sound somewhere that it makes when it boot? Please let me know in the comments)