There might be a few reasons why a PSP would have garbled characters when reading an e-book: 1. E-book format error:PSP supports multiple e-book format such as browser, MOBI, jade, etc. If the e-book format used is different from the format supported by the PSP, it may cause problems with reading garbled characters. 2. Wrong coding method:PSP supports multiple coding methods such as UTF-8, USB-8859-1, etc. If you use an e-book with a different code than the one supported by the PSP, it may cause problems with reading garbled characters. 3. E-book content error: If there is an error or damage to the e-book content, it may lead to the problem of reading garbled characters. The solution was as follows: 1. Make sure that the e-book format used is the same as the format supported by the PSP and is correct. 2. Make sure that the e-book code used is the same as the code supported by the PSP and is correct. 3. Confirm that the content of the e-book is complete and there are no errors or damage. If the above methods do not solve the problem, you can try to change the e-book or download the e-book again.