Question [Q] All Winner A20 - Please Help

Hi Guys

I have a All Winner A20, ARM Cortex-A7 Dual-Core GPU: ARM Mali400MP2 7 inch Dual Core A20 Google Android Tablet PC - Jelly Bean 4.2 - HDMI - Blue i have a root file buy i cant get it to boot from SD Card i hold the volume up and hold the power button it then says recovery mode hold power button to continue and it just recovers its self i have tried different ways to get a menu up but there dont seem to be one to load from sd card. i have looked over the net and cant seem to find an answer so maybe someone in here could help
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