i want to update (dfu)from sdcard .

[syc776]

update from sdcard ,read sdcard file and to update  ,have the example ? if no  ,can you tell me how to do it?

[syc776]

can you give more detail guide ？

[syc776]

i want to modify the bootloader ?  i want to know

how to modify?

[Hung Bui]

No, please follow the blog and guide I provided to study the bootloader.