[basttran]

Thank you Paraglider & Markismus for your pointers and kind advices.

I intalled KSM and koreader in the mean time and it does the thrick
nicely enough for pdfs at the moment (it was one of the reason I was
curious about dual-boot in the first place).

I still have to get the dictionnaries to work properly but it is
mostly about about finding the proper eng/fre resource and convert it
to the appropriate format

I also have to see what can be done with columned articles but for
what I've learned here so far, it is more about converting the pdfs on
a PC so I should be fine as well

I am still curious about dual-booting so some reactions/questions
below if you don't mind:

@Paraglider

Originally Posted by Paraglider

I guess we have to set bootcmd=bootcmd_SD.

Thanks in advance.

I am not familiar with u-boot but I assume it should rather be:

bootcmd= run bootcmd_SD.

Probably something you don't want to overlook when fumbling with hex.

@Markismus

Originally Posted by Markismus

Searching the forum is nearly impossible it seems at times, especially
when you don't have the correct search terms. Use the thread tips
and tricks for your initial searches. I think the uboot hack is
part of the threads on turning your kobo into a debian tablet.
Here is the u-boot wiki.

It is true that some newbies like me may appear as if expecting
someone to actually solve their problem but I like to do my own
homework and pointers for some correct search terms are greatly
appreciated. Thanks a lot for doing just that

Originally Posted by Markismus

After you have made a backup of your SDcard to your PC with dd, you
should also be able to dd a custom block to the SDcard. So you extract
the current uboot image. Hack it and copy it. The hack is done by
changing hexadecimal codes. So obviously, this could be a trial and
error procedure. If it goes wrong, you will have to open up the Kobo
to restore the original Uboot image.

So no, do not expect to do this, if you never want to open your case.

I understand that it is not necessary to open the Kobo unless
something goes wrong (which I also understand is quite likely - there
is "error" in "trial and error" after all). If yes does that mean that
once the backup is modified/hacked it can be written to the kobo over
telnet?

I am not a 100% reluctant to opening the case but I would be happy if
there is a reasonable chance to preserve the waterproofness of the
device (maybe someday I'll own a bathtub!).

Well I guess there is no harm in me playing with the SD card backup
until I want to make an actual attempt. I'll dig into this.

Just in case: is there a cheaper or older device known to behave similarly to the H2O?

Best regards,
Bastien