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Old 11-19-2021, 02:06 AM   #1
LuQQ
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I still disassembled the KOBO Libra2

Because of some problems(Automatic reboot,reboot,reboot......), I decided to remove libra2 and replaced the 128g tf card to enter the system normally. Although libra2 uses a tf card, it is covered with glue, which is probably waterproof glue. If you want to change the card, please be careful~~~ Unfortunately, the problem I want to solve has not been solved. . . too difficult. . . depressed.
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Old 11-19-2021, 03:51 AM   #2
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Oooh. It's a messy one to replace the sdcard.
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Old 11-19-2021, 04:01 AM   #3
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Whoa, you de-lidded the entire sdcard slot.

There were some pictures and discussions regarding the microsd in the first impressions thread as well

https://www.mobileread.com/forums/sh...d.php?t=342428

https://www.mobileread.com/forums/sh...43#post4166043

And some people in German ereader forum managed to remove the microsd card as well (from sister device Tolino Vision 6 which is also part of Rakuten/Kobo family of devices). https://forum.alles-ebook.de/thread/...0020#post90020 (unfortunately it seems you have to register to see this content)

However, one of those users also damaged their device in the process.

My Libra 2 also had a few reboots but I hope this is a software issue (happened in the past with sickel / watchdog too - the firmware checks for hangs and reboots if it thinks there is a problem) and so far it only happened when hacking around in the telnet shell, not during normal use. So I just hope its a case of the software watchdog being a little trigger happy, it's happened before in older firmwares

Last edited by frostschutz; 11-19-2021 at 04:12 AM.
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Old 11-19-2021, 04:30 AM   #4
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Originally Posted by frostschutz View Post
My Libra 2 also had a few reboots but I hope this is a software issue (happened in the past with sickel / watchdog too - the firmware checks for hangs and reboots if it thinks there is a problem) and so far it only happened when hacking around in the telnet shell, not during normal use. So I just hope its a case of the software watchdog being a little trigger happy, it's happened before in older firmwares
It seems there was a patch increasing the timer? Have you tried updating it and testing whether reboots will disappear? Or has the code changed?
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Old 11-19-2021, 05:20 AM   #5
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@LuQQ

sickel patch for FW 4.30
Spoiler:
Code:
sickel reboot timeout (20 sec):
  - Enabled: no
  - Description: increases sickel reboot time if no ping from 10s to 20s
  - PatchGroup: sickel reboot timeout
  - ReplaceBytes: {Offset: 0x003C70, FindH: 42 F2 10 71, ReplaceH: 44 F6 20 61}
  - ReplaceBytes: {Offset: 0x003C82, FindH: 42 F2 10 71, ReplaceH: 44 F6 20 61}
  - ReplaceBytes: {Offset: 0x003ECE, FindH: 44 F6 20 61, ReplaceH: 49 F6 40 41}
      
sickel reboot timeout (30 sec):
  - Enabled: no
  - Description: increases sickel reboot time if no ping from 10s to 30s
  - PatchGroup: sickel reboot timeout
  - ReplaceBytes: {Offset: 0x003C70, FindH: 42 F2 10 71, ReplaceH: 47 F2 30 51}
  - ReplaceBytes: {Offset: 0x003C82, FindH: 42 F2 10 71, ReplaceH: 47 F2 30 51}
  - ReplaceBytes: {Offset: 0x003ECE, FindH: 44 F6 20 61, ReplaceH: 4E F6 60 21}


DNSB once kindly made an instruction, how to use it

untested
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Old 11-19-2021, 05:53 AM   #6
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Thanks for the patch, tried the 30s one, even so I still got a reboot while using the beta browser. Maybe there is a different cause to it, like a memleak somewhere. It's stable when stressing it over USB, I hope that an actual hardware fault would not be so picky.
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Old 11-19-2021, 05:59 AM   #7
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There's possibly a power delivery shenanigan somewhere, because KOReader users have been reporting reboots (supposedly by the hardware watchdog, since sickel is out) that disappear with the wifi power enabled or the device plugged in...
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Old 11-19-2021, 06:01 AM   #8
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Quote:
Originally Posted by LuQQ View Post
Because of some problems(Automatic reboot,reboot,reboot......), I decided to remove libra2 and replaced the 128g tf card to enter the system normally. Although libra2 uses a tf card, it is covered with glue, which is probably waterproof glue. If you want to change the card, please be careful~~~ Unfortunately, the problem I want to solve has not been solved. . . too difficult. . . depressed.

What type/kind of tape did you use to secure the sdcard to the slot again?
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Old 11-19-2021, 06:10 AM   #9
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In addition to tape, a foam pad might also work (so the backplate will apply pressure to it)

or maybe just solder the legs of the lid back on... but its so much stuff so close together you really have to be careful with the iron

or maybe just glue the lid itself back on w/o getting glue in the sdcard path or contacts

Last edited by frostschutz; 11-19-2021 at 06:16 AM.
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Old 11-19-2021, 06:38 AM   #10
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What was the brand name of the original sdcard?
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Old 11-19-2021, 06:39 AM   #11
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Originally Posted by frostschutz View Post
In addition to tape, a foam pad might also work (so the backplate will apply pressure to it)

or maybe just solder the legs of the lid back on... but its so much stuff so close together you really have to be careful with the iron
I think ripping out the microSD holder is a very bad idea
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Old 11-19-2021, 08:35 AM   #12
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much simpler (I guess) is to use instant glue to put the microsd lid back down

glue is our enemy but in this case maybe it can be a friend as well

after all, soldering is only necessary for electrical connection but the lid has no purpose other than holding the microsd card down

just make sure the microsd card itself doesn't stick
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Old 11-19-2021, 09:02 AM   #13
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Quote:
Originally Posted by frostschutz View Post
In addition to tape, a foam pad might also work (so the backplate will apply pressure to it)

or maybe just solder the legs of the lid back on... but its so much stuff so close together you really have to be careful with the iron

or maybe just glue the lid itself back on w/o getting glue in the sdcard path or contacts
Yes,you are right,I just glue the lid itself back on
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Old 11-19-2021, 09:04 AM   #14
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Quote:
Originally Posted by frostschutz View Post
much simpler (I guess) is to use instant glue to put the microsd lid back down

glue is our enemy but in this case maybe it can be a friend as well

after all, soldering is only necessary for electrical connection but the lid has no purpose other than holding the microsd card down

just make sure the microsd card itself doesn't stick
Yes,you are right~and I think this is the easiest way
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Old 11-19-2021, 09:08 AM   #15
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What was the brand name of the original sdcard?
This one
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