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I've manage to contact Johny from boust.com.cn to get that RK27SDK.RKW file.
After i'm using the RK27 Device manager and copy all the system files in the MP5 hidden partion using rkusb.tag method my mp5 is working like before.

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To delljoe:
I have the same problem: I've found the exact firmware fr my PMP, but I need RK27SDK.RKW file.
Please, can you help me?
Meny thanks.
Roberto