Hola de nuevo, con el flashtool le he hecho un ram test >> Data Bus test y el resultado ha sido este, por lo menos me lo ha reconocido:
=============== Memory Detection Report ===============
Internal RAM:
Size = 0x00020000 (128KB)
External RAM:
Type = DRAM
Size = 0x20000000 (512MB/4096Mb)
NAND Flash:
ERROR: NAND Flash was not detected!
EMMC :
EMMC_PART_BOOT1 Size = 0x0000000100100000(4296015872MB)
EMMC_PART_BOOT2 Size = 0x0000000000020000(0MB)
EMMC_PART_RPMB Size = 0x0000000000000000(0MB)
EMMC_PART_GP1 Size = 0x0000000000000000(3909091328MB)
EMMC_PART_GP2 Size = 0x0000000000000E90(334092148MB)
EMMC_PART_GP3 Size = 0x178EF98400000008(27438347036838711MB)
EMMC_PART_GP4 Size = 0x000000BC178EF894(23991615113072789MB)
EMMC_PART_USER Size = 0x0F4D9EBA00000001(395245792MB)
============ RAM Test ============
Data Bus Test :
[D0][D1][D2][D3][D4][D5][D6][D7][D8][D9][D10][D11][D12][D13][D14][D15]
OK!!
Alguna ayudita por fa
es que no sé qué hacer.