Thread: Kobo Touch N905 - need external sd boot
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Old 07-06-2021, 09:49 PM   #7
davidfor
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Posts: 24,905
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Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by NoPro View Post
thanks for your answers. im still in hope that there is someone alive in the kobo giving me rescue signs by the red light sigals

i created the image of the briked kobo with win32diskimager.
In that case, I don't think it is a valid image. When you connect a working Kobo ereader by USB, it only presents one partition. That is the partition with the books. It doesn't have the root or kernel or anything. Trying to boot from that would not work. And the size mentioned below agrees with this.
Quote:
i tried to boot this image from the external sd by powerup+home btn - blue led blinking slow.
i tried the "external sd boot method" with an other good kobo touch. copied the 1,4gb partition with HDDRawCopyTool and tried powerup+home btn - blue led blinking slow... doesnt work

can you give me some advice how to boot?
is there a way to the serial output from the kobo with a serial-usb adapter.. soldering the cable to the kobo is no problem.
There is some discussion in the forums about using the headers on the PCB to connect to it. I don't remember if they got it to work or not.

If you have a working N905 Touch, you might be able to create an image using that. You should be able to telnet into the working device and us the dd command to create an image of the device on the SD card. Then use that to create the bootable SD car for the non-working device. I think this would work, but, I am not sure. And I don't know the dd command well enough to suggest what the parameters should be. Telnet is turned on when you turn on the developer mode. And that has an option to force WiFi on so it won't go to sleep when executing the commands needed.

As possible test of this is using the image from the N905B Touch. I think this might be close enough to the N905 to boot. I'm not sure of that, but, something in the back of my brain suggests it is. I don't think it will work completely, but, might get further than you currently have. I have sent you a PM with the link to the image if you want to try it.
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