Hi
I used the latest OTA update, to be welcome by a five page quick help file. After perusing it (t's intended for beginners), I realized I could not get out of it.... Not a single menu available, even to exit Koreader.
I had to turn nasty. Connect on USB and destroy this file (in Koreader/Help) and its sdr. Then (I have a PW3) pressing a long long time the button to force a restart.
Koreader informed me on restart that it could not find this damned file and let me free with the file manager.
I am not sure that this experience will help any beginner...
Edit: it's worse than that. Even with normal files, all access to menus is lost... The question now is how to revert back to the previous build. Unexpected OTA indeed!!