Do U know how can I open it? I use more tools but nor work...or how I can put on the andypad pro?? I need help...
You need the RockChip flashing tools (e.g. the one for Teclast), and I also think flashing from SD works (once drive is remounted it'll ask to flash). I haven't tested that though.
As for unpacking the update.img, use AFPTool.exe from Windows (or wine..), to unpack system.img you have to unpack the cramfs (7zip can do this, or mount it in unix using the cramfs mount command).
kernel.img format: [KRNL 4 bytes] [ 4 byte kernel.bin size (little endian)] [ kernel.bin content] [rkcrc 4 bytes]
boot/recovery.img format: [KRNL 4 bytes] [4 byte initrd block size] [ initrd block (gunzip + cpio)] [rkcrc 4 bytes]
AFPTool has a pack command too. Wendal released some great tools for the rk2918 SoC.
Should get you started I guess?