[notStanislaw]

Sorry for tripleposting, apparently new forum members aren't allowed to edit their posts, probably for good reason.

I found out the nickel/firmware version was not updated, so after making a backup of the entire filesystem I updated it to the recent one, then reran the one-click install.

Spoiler:

Software version: 4.16.13268
Software version: 4.25.1587

I've also turned off nightmode/screen inversion. Everything seems to work.
These are the last lines from crash.log, then those with a grep that seemed relevant.

Spoiler:

01/07/21-16:35:40 INFO  Kobo suspend: going to sleep . . .
01/07/21-16:35:40 INFO  Kobo suspend: asked the kernel to put subsystems to sleep, ret: true
01/07/21-16:35:42 INFO  Kobo suspend: waited for 2s because of reasons...
01/07/21-16:35:42 INFO  Kobo suspend: synced FS
01/07/21-16:35:42 INFO  Kobo suspend: asking for a suspend to RAM . . .
01/07/21-16:35:42 INFO  Kobo suspend: ZzZ ZzZ ZzZ? Write syscall returned:  true
01/08/21-02:59:18 INFO  Kobo suspend: woke up!
01/08/21-02:59:18 INFO  Kobo resume: clean up after wakeup
01/08/21-02:59:18 INFO  Kobo resume: unflagged kernel subsystems for resume, ret: true

Spoiler:

 $  grep --context=2 'error\|warning' 210109crash.log
ffi.load: blitbuffer
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
SDL2 not loaded:	./setupkoenv.lua:27: Not able to load dynamic library: libSDL2-2.0.so.0
01/07/21-02:08:04 INFO  initializing for device Kobo_frost
--
ffi.load: blitbuffer
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
SDL2 not loaded:	./setupkoenv.lua:27: Not able to load dynamic library: libSDL2-2.0.so.0
01/07/21-11:35:40 INFO  initializing for device Kobo_frost
--
ffi.load: blitbuffer
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
SDL2 not loaded:	./setupkoenv.lua:27: Not able to load dynamic library: libSDL2-2.0.so.0
01/07/21-11:40:48 INFO  initializing for device Kobo_frost
--
ffi.load: blitbuffer
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
SDL2 not loaded:	./setupkoenv.lua:27: Not able to load dynamic library: libSDL2-2.0.so.0
01/07/21-12:01:12 INFO  initializing for device Kobo_frost
--
ffi.load: blitbuffer
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
SDL2 not loaded:	./setupkoenv.lua:27: Not able to load dynamic library: libSDL2-2.0.so.0
01/07/21-15:26:21 INFO  initializing for device Kobo_frost
--
ffi.load: libs/liblept.so.5
ffi.load: libs/libk2pdfopt.so.2
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: Unable to read ICC workflow
warning: Attempt to read Output Intent failed
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: invalid key in dict
warning: cannot load object (7457 0 R) into cache
error: Unable to read ICC workflow
warning: Attempt to read Output Intent failed
01/07/21-15:35:09 INFO  opening file /mnt/onboard/Morton, Timothy/Hyperobjects - Morton, Timothy.epub
01/07/21-15:35:10 INFO  RD loaded plugin SSH at plugins/SSH.koplugin

If there is anything I can do to help the KOReader project forward, let me know. I'm not sure which logs may be useful at this point.

On a personal note, I could use some advice on what to do with the devices, now. Would it be wise to factory reset the old one and return it, or is it better to cancel the replacement from the retailer? Any opinions?