The 4.31.19086 too buggy on Elipsa
The 4.30.18838 also is too buggy: Stylus battery sometimes doesn't register. BT on sometimes doesn't turn on BT, but tapping BT toggle always turns on WiFi. An Advanced Notebook hung ereader & all cotent was deleted.
I've gone back to 4.28.17925, which while having BT as a beta feature, works better than 4.31.19086 or 4.30.18838
Checking
https://pgaskin.net/KoboStuff/kobofirmware.html and the Kobo forum here for any newer version than 4.31.19086 that fixes bugs.
But on all versions the Elipsa seems only just worth the money as a 10.3" ereader with a separate ewriter notepad with handwriting to text & buggy undocumented shape/equation editing. Finger selection with touch key or BT keyboard text input is the only really useful annotation, just like a Libra 2 (or earlier Kobo with no BT). The stylus annotation only good to copy back visual PDFs, no use for workflow proof edit as no real text.