I post very rarely so please excuse any errors. Got interested in this after seeing some recent posts on the kindle. The best price I have seen so far.
Spiel from the website. The next-generation Kobo Libra 2 is the embodiment of your reading style. With more storage, a faster E Ink screen, and Bluetooth® wireless technology so you can listen to Kobo Audiobooks*, Kobo Libra 2 is an integral part of your rich reading life. Packed with features and personality—and 32GB of storage for all of your eBooks—Kobo Libra 2 was made to do more. An ergonomic design keeps your reading life on hand—and page turn buttons keep the story going while you sip your coffee, stir your signature pasta sauce, or nurse your newborn—so you can read on and on, no matter what. Personalize your Kobo Libra 2 by choosing between black and white and eye-catching SleepCover colours. We made Kobo Libra 2 with your passion for reading, and your life, in mind. Your eReader, your story.
Has an internal MicroSD that's replaceable, but it's more effort than for the Clara HD for example.
It's glued down and there's some coating over the entire board, so soak it in some alcohol and be prepared for some very careful wriggling for quite some time. Eventually with much, much persistence it'll come loose.
Transfer to new MicroSD (512 GB here), use gparted to resize, install KOReader, etc., etc. Just be aware that if the native firmware doesn't like the state of the filesystem (as might happen on particularly bad unmounts) it'll reformat the whole thing, so between this and general common sense most of the time I just use SFTP from a known good mirror copy of its contents that doubles as a backup.