This is a safety protection of Motorola. You need a factory cable Motorola through which to connect the phone in a state NvFlash or in other words to connect pin 1 (Vcc +) with free pin 4 (ID) in micro USB socket where the receipt autonomous power over cable and not use batteries which bypass protection of Motorola and set the phone in low-level programming mode. Set the phone in low level programming stage (aka APX mode), enables you to send commands directly to the nvidia Tegra 2 chipset processor. NVflash is the ultimate tool for recovery and flashing roms. This tool can bring your device back from the dead in most any situation, even those hard to fix corrupted bootloader issues. It will allow full recovery of device, backup of all partitions on device and individual flash of partitions.
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There is also another method to connect directly to Tegra 2 processor and it is via UART serial port through audio jack (use adapter like this -> http://www.ebay.com/itm/CP2102-Module-USB-to-USART-UART-3-3V-TTL-USB-To-COM-Free-Cables-/170946368201) -> Google it ...!
This is a safety protection of Motorola. You need a factory cable Motorola through which to connect the phone in a state NvFlash or in other words to connect pin 1 (Vcc +) with free pin 4 (ID) in micro USB socket where the receipt autonomous power over cable and not use batteries which bypass protection of Motorola and set the phone in low-level programming mode. Set the phone in low level programming stage (aka APX mode), enables you to send commands directly to the nvidia Tegra 2 chipset processor. NVflash is the ultimate tool for recovery and flashing roms. This tool can bring your device back from the dead in most any situation, even those hard to fix corrupted bootloader issues. It will allow full recovery of device, backup of all partitions on device and individual flash of partitions.
More info:
http://www.tabletroms.com/index.php/2011/06/12/official-nvflash-recovery-rom-asus-transformer-released/