To start with many people believe 1.22B05 is as stable as and works better than 1.21 so based on that I question your line of thinking but going onward....
I'm sure D-Link does much testing however it's impossible to replicate every real world condition out there. This is especially true for people who make their own "enhancements".
WW-DRT can never provide software to work for the 6xx series of routers because they are based on a very different operating system (additional information posted elsewhere). Parts of it operating system are proprietary and not publicly available.
I do agree however that it would be nice if we could downgrade from 1.3x versions of the firmware to lower version. I'm still not really sure why this can't be done, all the explanations I've seen so far just sound like excuses!
I really wonder how many end users ever upgrade the firmware on their routers. My bet would be that most users never do in their router is still running whatever firmware version it came with. Thus those of us who were constantly changing our firmware are in the minority and not truly D-Link's bread and butter.
My line of thinking comes from more than two decades in IT, and holding nearly two dozen certifications in the industry from MSFT, AAPL, and CSCO.
My 655's are not my sole internet connection routers, hence, I can modify and play with them without regard to any resulting ramifications. I only ever test firmwares that promote higher stability, better security, and or the possibility of speed enhancements based on whats been updated with the firmware in the release notes. Sometimes this requires the ability to read between the lines. Therefore, my statement concerning v1.21 being the last truly stable version comes from a culmination of substantial experience in the industry and actual hands on testing.
As for Lycans statement about the sales of the 655, well, the 655 is D-Link's highest selling router simply because of its initial magazine reviews. First impressions are everything, ...bottom line.
I'm not totally dogging D-Link so to speak. Cisco's sub brand Linksys, is far more unstable (unless you use DD-WRT). However, my Cisco PIX is about as solid as they come. And Apple's Airport Extreme is simply not secure enough.
Lycans observation of why aren't more people complaining if v1.31 is so unusable goes hand in hand with the last paragraph of your quoted statement above. Simply not enough people ever upgrade, which I completely agree with if there are no benefits to be gained or immediate problems to be solved. However, this in no way can be used as a valid measurement of v1.31's stability just as Lycan is claiming that people with issues in this forum can in no way be used as a valid measurement of v1.31's instability.
The bottom line is simple logic. If everything in the environment is stable and working, and the only change made to this environment is the firmware, then its the firmware. The odds of this are much higher than the odds of coincidentally having some other inadvertent hardware failure elsewhere at the exact same moment the firmware on the router just happens to be upgraded. That's just completely illogical.
And "decides", the best advice that could be given at this point would be to follow the step's "kentuck1163 used in this post:
For the record, I've been running 1.31 for a couple days now with no issues at all. So far its been great! I was having a problem with 1.30 with severely degraded wireless speeds (to the point where my DSL speed tests were reporting about 600-1000Kbps when I should have 6000Kbps service. Anyway, I reset the router to factory defaults and started making changes one by one and then retesting connection speeds after every change. However, I never was able to get it to start messing up again.
D-Link is unfortunately going to need detailed information about the failure, in addition to an open mind, in order to actually resolve the issue.
And Lycan, my last note would be if v1.31 was simply wonderful and without issue as you would appear to suggest, then there would not be a single post of failure in this forum about it.
Respectfully,
Tommy Lee