PocketBook has now posted a 6.5.x upgrade for the HD3 on their website. It's newer than 6.5.1121 (6.5.1383).
https://www.pocketbook-int.com/int/s...ook-touch-hd-3
Quite a few changes in the release notes.
https://support.pocketbook-int.com/f...D_3_EN_6.5.pdf
Not sure if I want to upgrade, now that Overdrive is working again.