when you look exactly the "last" update copied some missing libs and the new dsod, everything else (meaning the "broken" dso.exe, which seems to be not broken btw.) is the same. A new rcS and /model (what are they doing with that? i see it is on latest benchtop model as well, hmm, will have to take look on that). Anyway, so far evrthing should be ok.
I'm wondering about two things:
1- the new rcS is loading run.sh, which starts then the dsod, but not dso.exe (so i assume the newest dsod is calling the dso.exe or dso_bin itself, haven't check that but i trust them here, a day old "B" model firmware is doing this exact the same way). I'm wondering only that they implemented this on such old "S" models as yours, but yeah, they should know what they doing.
2- what is with the lib and lcd drivers on your handheld? Look your bootlog:
insmod: can't insert '/lib/cfbcopyarea.ko': No such file or directory
insmod: can't insert '/lib/cfbfillrect.ko': No such file or directory
insmod: can't insert '/lib/cfbimgblt.ko': No such file or directory
insmod: can't insert '/lib/s3c2410fb.ko': No such file or directory
....
Please press Enter to activate this console. cannot open lcd
i did loaded "BV" model image, from 2011, so even older than your "S" model, then installed the first "S" model firmware - all working, and now used that manual update procedure - and everything works here. So it looks like the new dso.exe HAVE TO BE started by dsod (or manually, but not anymore from rcS, so that's why you got new one). Anyway, everything seems to be working (as far i can see on my dev board).
I your older bootlog there is no such problem with lib directory, so i assume you wiped that directory at some time (this is why i did checked myself if one of hantek's updates was responsibe for this, but it wasn't). I would say, send them that bootlog, they can easily compile for you zip file with all the missing files (i would do this for you, but i don't have any dump of "S" model and even if my dev board works, i can not guarante that my lib dir is complette, so better when Hantek compile for you this).