Hi Mango,
Unfourtunatly i'm away until Monday, I don't have the direct links saved on my mobile (I accessed them on my desktop) phone however, in the meantime you can view the changelog here:
https://www.ukvoipforums.com/viewtopic.php?p=4273#p4273A changelog for the OBi202 firmware can also be found here:
https://www.ukvoipforums.com/viewtopic.php?f=25&t=987I wouldn't normally post links to my site in this section that but rather than keep you waiting I figured i'd make an exception. I will post the direct links once I get back to my desktop on Monday, might come in handy and help you identify the next changelog URL.
Also, thanks for the heads up regarding the main difference between the 5.0.x and the 5.1.x firmware, I only have the one OBi1032 so it's hard for me to compare between the two versions. My memory isn't what it used to be!