My 505 is totally out of order.
A few days ago, I am unable to read books in my SD card; well, it is not a big deal
Then, something serious happened.
1) I can use the Power switch to "turn off" the reader, but I cannot turn it on anymore (the screen just blinks once) ! I have to reset the reader
2) After the reader is reset & restarted, it does show info like how many books are available. But no matter which button I click, I always get the Invalid Operation icon at the bottom right corner. I can do nothing now.
What's the problem it is?