You should try to upload a splash screen picture from your SD card - if you can't maybe the SD reader is the culprit.
Easier yet, copy a few MP3s to the SD.
There are some custom screen images on this message board. The Z1xx series can use a large variety of sizes.
Splash screen images should be used within the following formats;
— BMP or JPEG files
— Allowable horizontal and vertical size are 2592 pixels x 1944 pixels or smaller
— Allowable data size is 6MB or smaller
From the Manual:
1 Create a folder named “Pictures” on the top-most directory of the
SD memory card and store the picture files in this folder.
2 Store the picture files in “Pictures”.
3 Insert an SD memory card into the SD card slot.
4 Display the “System Settings” screen.
5 Touch [splash Screen].
The “Select Splash Screen” screen appears.
6 Touch [select from SD].
The “Select Splash Screen” screen appears.
7 Touch the image to use as the splash screen from the list.
The image is displayed on the screen.
8 Touch [OK].
The image is set as the splash screen, and the system returns
to the “System Settings” menu.