Kobo warns beta testers not to downgrade after data loss

Here's a rule worth remembering: never update anything the week before a launch. Kobo just gave every author with a backlist on its devices a live demonstration of why.

The company's 6.0 beta is breaking core functions on Kobo e-readers right now. Libby library borrowing has stopped working. Users are stuck on endless loading screens. Even the clock — a basic, boring feature that's worked for years — has disappeared. And it's not a quiet opt-in gone wrong: Good e-Reader reports a giant pop-up is actively prompting users to install the update, pulling more readers into the mess.

Kobo's statement is unusually blunt for a tech company. They're telling beta testers who've already lost data — annotations, highlights, sideloaded content, or "My Words" — to not revert to a previous software version. Doing so, Kobo says, will permanently delete what's already gone, with no way to restore it in future updates. Read that twice. The fix isn't available yet, but the undo button is already broken.

For authors, this isn't just a gadget story. If you sideload ARCs, box sets, or your own formatted files onto a Kobo for testing or personal reading, that content is exactly what's at risk. So is anything a reader has highlighted or annotated in your book — the kind of engagement data some authors use for reviews, quotes, or reader feedback. If your reader is one of the ones affected, their notes on your book could be gone for good.

Here's what to actually do this week: if you haven't opted into the Kobo 6.0 beta, don't. Good e-Reader's reporting doesn't say when a stable fix is coming, only that Kobo's engineering teams are "working around the clock." That's not a timeline you can plan around. If you're already on the beta and have lost data, follow Kobo's own instruction to the letter — don't revert, don't reinstall an older version, don't try to fix it yourself. Wait for their update.

And if you manage a mailing list or reader group, this is a two-line email worth sending: tell your Kobo readers to skip the beta prompt if it pops up, and to hold off reverting if they've already installed it and lost data. It costs you nothing and it protects goodwill with readers who trusted your recommendation to read on that device.

My take: this is Kobo's mess to clean up, not yours. But "not my mess" and "doesn't affect me" aren't the same thing — so keep your own devices off the beta channel until Kobo confirms it's stable.