Red dot light xbox 360

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Hello,
I was using simple nand flash and i got a bad blocks and so i dump the nand file lot time and my xbox got red dot light and E71 code error message , so i have an original nand file but i cant write the original file cuz i cant joing to the dashboard when i turn on the xbox give me that error message , so plz help me cuz i tired yo fix it i search about thats problem but i got nothing please hellp me
And my English not very well so i hope you understand what i wanna tell you


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