The old firmware on this Kobo Mini is 2.1.5. Today I did an update, it is 2.4.0 now.
Here is the guide to make update.
1) Make sure you’re within range of an available Wi Fi network, and that your eReader’s battery is fully charged. You must stay within range of this network while your eReader updates.
2) From the Home page, tap the Menu icon.
3) Tap the Sync button.
4) Your eReader will connect to the network and will inform you of an available software update.
5) You will be asked to agree to the update.
6) When finished the update, the eReader will inform you and restart. Once it is powered up, you will see the list of What’s New.
Here is the release notes I received.
Allow adding user specified icons to the main book list for books whose metadata matches specific criteria. Go to Preferences->Look & Feel->Column icons to setup these icons. They work in the same way as the column coloring rules.
Allow choosing which page of a PDF to use as the cover.
Add option to turn off reflections in the cover browser (Preferences->Look & Feel->Cover Browser)
PDF Output: Add an option to add page numbers to the bottom of every page in the generated PDF file (look in the PDF Output section of the conversion dialog)
Add the full item name to the tool tip of a leaf item displayed in the tag browser.
Fix out-of-bounds data causing errors in the Tag Browser
Conversion: Handle input documents that use multiple prefixes referring to the XHTML namespace correctly.
PDF Output: Fix regression that caused some svg images to be rendered as black rectangles.
Metadata download: Only normalize title case if the result has no language set or its language is English
Linux MTP driver: Detect devices that have MTP interfaces even if their USB ids are not known
Content server: Allow picking a random book by clicking the ‘Random book’ link on the start page. You can also refresh the random book page to get a new random book
E-book viewer: Add an option to hide the toolbars in the viewer window (Preferences->Miscellaneous->Show controls in the viewr preferences). You can unhide them by right clicking in the viewer window.
Kobo driver: Speedup initial connect by avoiding unnecessary update of series metadata in some situations.
Get Books: Allow the store plugins to be dynamically loaded so that future website changes of a store dont require a calibre update to fix Get Books.
Wireless driver: Always replace file when resending a previously sent book to the device, even if the title/author have changed.
Add PocketBook Pro 912 driver.
When creating/exporting epub and mobi files, add the calibre book identifier as a special field in the book’s metadata. This allows third party tools to identify the book record in calibre to which the file belongs.
Wireless driver: Add support for using the book uuid as the filename
Remove the experimental tag from the subset fonts feature, since there has been only one reported problem (now fixed) with it in the two months since it was released