Thread: After upgrading my Kobo Aura H2O fails to load in Calibre 3.48.0
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Old 04-13-2020, 01:04 AM   #8
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 cgronier View Post
As I said in my initial post, calibre is running on a Mac and indeed the reason I am stuck to version 3.48 is because it is said on the calibre web site that with my current OS (10.11.6 -El Capitan) that is the most recent version of Calibre I can use.
And no, I can't install a more recent OS on my Mac.

So here is where I am now :
- I (painfully) managed to while out my Kobo device and install an older firmware on it.
Il installed firmware 4.15.12920 that was rereleased in May 2019.
Why this version ?
Because it was issued BEFORE the release of Calibre 3.48.
So I assume that the Calibre developers would have had the chance to implement the support of this particular Kobo firmware.

A side issue of this journey is that during all theses restarts of the Kobo it kept 'importing' stuff. I only discovered in the end that it was in fact rebuilding the database will all the books I have of the SD card...I should have removed the card before the wipe out and downgrade process...

Il will now try to connect Calibre to this newly installed Kobo ans see what happens.
There have been very few changes to the firmware over the years that have meant needed real changes to the driver. But, because there is a potential for it to happen, the driver does have a maximum firmware version that I update after testing each release for changes. The driver also has an option to ignore this, the "support newer firmware" option. This is intended to allow full function of the driver until the update to the supported version can be made and is released.

For those stuck on calibre version 3.48, it is safe to use this option to support the released versions of the Kobo firmware. And probably will be for the foreseeable future. Kobo tend to keep things backwardly compatible. But, the 4.20.x firmware was the first for a long time that had something in it that needed a driver change. This is the Series tab. To see sideloaded book in this, what the driver needs to set on the device changed. Older versions of the calibre, and hence the driver, will continue to work, but, sideloaded books won't be shown in the Series tab.
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