Though I'm not a keen beta tester I gave your latest build (2018.03.25) a try on my KT3.
Basically, CR works as expected, i.e. there's nothing broken relating to read eBooks with this low resolution "legacy" device. Except that a feature which I like very much doesn't work any more with this build: The user provided
sleep pictures in /vlasovsoft/sleep/* aren't used any longer. Instead, the Kindle uses the internal standard pictures. (Of course I've made sure that I didn't overwrite my pictures in this directory while updating all the other files.)
And the clock display in the status line is 1 hour off with this build.
Also, another old bug is still there: Right after starting, the
Calculator requires to touch "Clear" once before you can do the very first (algebraic) calculation. E.g. "4 x 5 =" will give the "result" 0 if you didn't press Clear before. Interestingly, functions (like sqrt and x²) don't require this additional step.
Reverted back to build 2018.01.23 ...
