Now, I have all of it. Decompiled and readable in plain english (programming langauage Java). Specifically I was right (there is that damn concept turning into facts again). The ESS likes 80Mhz as the sweet spot and 100Mhz as it max for CLK. looks like the 1.2.3. firmware went above 100mhz for the ESS CLK hence the sound degredation being reported. Why they decide to muck with the CLK signal is beyond me (again experience says, no version control and no software repository with incremental changes being kept).
Music.apk file is broken down into 162 components with a specific set used for the ESS chip (and btw it is RockChip doing the development work). Now the fun part is to decipher which part is the ESS. Security through obscurity. Already found the component that outputs SPDIF. trying to figure out if that is from the ARM CPU or the ESS. with no IDE, makes reverse engineer a huge connect the dots game (read time consuming).
Great you have all of it. How does it sound? 1.1.7 sounds great to me. I have used 80mhz oscillators, 50 and 100 in a portable dac I built. With the particular crystal chip I was using, 80 did it for me. This proved out in listening tests.