I by apad with custom firmware v4.5 by Rogerbraun Apad v2 with red led, i try to flash v5.1. I wait 30 minuts and get error. When i try to flash again i get ERROR: TestUnitReady failed, Errcode (-3). tried a RKAndroidDM and RKAndroidTool, but still getting this error.What can I do?Please help!