Answer:
R4i Gold V1.5 is very old version of the kernel. Now R4i Gold card use wood r4 kernel, and the latest version is wood r4i V1.32. You can update with below steps:
1. Download latest software from official website.
2. Unzip the patch, you can get some files.
3. Connect your TF card with computer through a USB reader, and format the TF card.
4. Copy all files to the root Directory of TF card.
5. You should also copy some game or media files to the TF card.
R4i Gold installation finished.