Check out how to easily wipe cache partition in ZOPO ZP500. This operation won't affect your personal files it will only remove temporary cache files. As a result you can refresh Android 4.0 Ice Cream Sandwich system and optimize MediaTek MT6575.
When the Zopo logo appears on the screen release both buttons.
You should be in the Recovery Mode now. Use the Volume Up and Volume Down buttons to move through the menu.