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BootLoader + Downloader USB CDC Single Slot Flashloader Error!

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Hello,

Actually my whole concept is 

my bootloader have Bootlaoder and Downloader both with USB CDC blocking mode and i use the single slot to update the code so bootloader will donwload the code from the Renesas Flashloader Utility and then it sends the bch file to the bootloader and it downloads it and rewrite the MCU by new updated firmware

 

I have built BootLoader + Downloader USB CDC Single Slot Flashloader, and it works perfectly for small sized bch files but for the higher sized bytes it just shows 

Can any one explain me and my codes are attached here within one is Bootloader+ Downloader and other is image App that i want to update in MCU.

i have uploaded on google drive please find the link:

 

code link: https://drive.google.com/open?id=1VkUYG_LOV3fqPHfhzLHHgEld-pbiecwq


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