I've already posted about this update in another thread:
https://www.mobileread.com/forums/sh...42#post4273742.
Installed, rooted, works fine.
It looks like they removed it, at least according to this
update link.
If anyone needs an upx file, it's still available here:
http://firmware-us.boox.com/c9c6293c...62d/update.upx.
Onyx/Leaf2/Leaf2:11/2022-11-14_16-04_3.3.1_41f225958/1734:user/dev-keys