Does the subject want to ask "What if ibook can't download yunshu"?

1. First, be sure to update the iPad to the latest system version and restart the iPad.

2. secondly, go to settings > [your name ]”>“iCloud, try I Cloud cloud disk and books, and then reopen them. Try changing the network to see if the problem occurs.

3. finally, go to settings > general > restore > restore all settings. Your iPad will restart and all settings will be removed, but no data and media will be erased.