I have been rolling the firmware from
installation is easy, just do it as you are doing stock firmware. I have been rolling back and forth so many time now...no brick!!!
unzip files >>>>packages>>>software update tool
****Please upgrade to 3.0.2 before applying modified firmware****
Ultimate
DMP 1.0.1
DMP 1.0.2
Stock 3.0.2
Using stock IER Z1R cables and Z1R
There are definitely improved depth and width on the 3 modded firmwares. However, the best to my ears will have to be DMP 1.0.2 as it is detailed but smooth out some of the hot coming lower trebles textures
the DMP 1.0.1 is actually Muddying this very specific sections, the same for Ultimate.
The amazing things is that the stock firmware for my WM1A has a very hot coming Edges of textures on lower trebles. It has sibilant on female vocals and high string pitches.
The modified firmware took care of this, and the differences as described as previously.
I love the DMP Z1 1.0.2 version as it elevates the soundstage exactly where I wanted it, more width and depth, retaining this vertical axis. The overall sound signatures are closely resemble one another. Bass is more articulated with better textures, better controls, still deep and rumbling. Female vocals are so good now, vividly detailed!!! Same as high string and winds.... flutes ... addictive !!!! The high spectrum certainly becomes a lot more airy with all the improved textures, resolutions and precision’s.
Loving it!!!!
Now I am curious, could the stock firmware of WM1Z be ported without additional tweaking to Wm1A ? I would like to try and see if the WM1Z slightly take care of that low treble edges
one thing to note: if you are enjoying the Bass and sub bass on the Walkman currently, you will find the bass on the DMP Z1 1.0.2 to be boring. IMO, this is the bass done right as it is cleaner, better speed, controls, textures. So, please remember that my impressions will be different than your as my unit is very different than your, also preferences. But as far as my experiences goes, the Walkman has a less controlled bass VS the modified firmware one. The Ultimate as provided, or based on V1 of DMP Z1 and trying to combine 1A/Z will have this less controlling bass lines and performances