// Internal buffer for reading chunks static uint8_t file_buffer[CHUNK_SIZE];
Use software like H2testw to verify that your SD card actually has the capacity it claims. A corrupted uupdbin flash is often caused by "fake" cards that overwrite data once they reach a certain limit. 3. Writing Binary Data to the SD Card sd+card+uupdbin
Certain wireless chipsets (e.g., Realtek RTL8821CU, RTL8723DS) have debugging features enabled by default in some firmware versions. When the chip encounters an error (e.g., connection drop, power cycle), it dumps a Protocol Data Unit log directly to the root of the first accessible writable volume—often the SD card. The file is named uuPdu.bin as a generic placeholder. // Internal buffer for reading chunks static uint8_t