[novatillo900]

Hola mekybocao, lo que te proponía de cortocircuitar los pines, no es solo para ponerla en modo MaskRom, sirve además para resetear la nand.
Me parece piensas que es lo mismo que haces cuando pones MaskRom con el ordenador y haces un Erase Flash, pero creo que no lo es.
El procedimiento aplica al error que tienes, en http://wiki.radxa.com/Rock/unbrick
When writing update.img to nand RKBatchTool failes with following message: "Prepare IDB Fail" (or similar error messages like "IDB download failed" when writing to nand with other tools)
El procedimiento lo he encontrado mejor explicado por Riley en http://freaktab.com/forum/tablet-sup...g-a-kitkat-rom

1. Remove the back of the tablet. Be careful not to break anything. Since I'm in the medical profession, I used a scalpel blade and a guitar pick to achieve this feat. Just start on one of the corners away from the side that has the connectors and buttons. You'll figure out pretty quick how the back is attached...with a series of clips that are easily pulled back. Just work your way around the tablet, being careful not to loose the buttons that fall out.
2. Locate the NAND chip.
3. Read the part number on the NAND chip and look up the data sheet on that chip to find out which pins are used to reset NAND. Some list 7 and 8, some list 8 and 9.
4. Connect your tablet to the PC and use the correct external button combination to get into flash or "loader" mode and see that the flash tool is open and recognizes the tablet in "loader" mode.
5. With a paper clip or the exact o knife, short pins 7 and 8 on the NAND chip. (or pins 8 and 9...whatever the data sheet said. You may have to short several sets of pins to locate the correct ones...kinda risky...but the alternative is having a useless electronic brick, anyway...so what the hell...)
6. When you have the proper pins shorted, you will see the flash tool recognize the tablet in "mask mode". You may have to keep holding the power button during this process if it goes off when you release it.
7. While in "mask mode", Erase IDB and flash the ROM (with the LOADER checked, this time)
8. When the flash is complete, your tablet will go through the first boot process as usual.

El punto más delicado es encontrar la combinación de pines que depende de cada chip Nand, por lo que antes puedes buscar con el número serigrafiado en el chip el data sheet para confirmar.
Para encontrar el chip en la P9 mira la foto de http://freaktab.com/forum/tablet-sup...804#post493804, en este foro, un par de mensajes más tarde, verás como le ha ido bien.
Mira en http://www.htcmania.com/archive/index.php/t-824629.html a otro que le fue bien con una Pipo M9.
Suerte y Saludos.