Dude, there working on it. I presume that like most FW and code development, it takes time to fix things, test and make sure it works. I personally rather have good code that has been worked on well and tested well and not rushed to the public. I believe there are many people involved in the DGL-5500 development than just a few engineers at D-Link. Remember, the SB engine belongs to QualComm...
Give them some time and be patient.
You have only posted twice and have not provided any detailed information beside to complain about what you perceived as being "lazy" in FW development.
I highly recommend that you give us more details on your perceived problems so we might better help you figure out what is the real problem.
I've been using the v1.12 FW for a while now and it's been pretty solid for me.
I suggest you review this and post your finding in a new thread and lets figure out whats going on:
Router Troubleshooting Suggestions and TipsIf your not willing to let us help you then we'll consider this a user issue and not a router issue.
When I load that firmware onto my router it says it's dated 5 Dec 2013. So have they been sitting on this update since then, or do they just not care enough to properly update the timestamp? Either way, I am seriously unimpressed with DLink's lazy attitude toward supporting this expensive router. I think this will be my last piece of DLink gear.