b'esptool.py v2.8\nSerial port /dev/ttyUSB0\nConnecting....\nDetecting chip type... ESP8266\nChip is ESP8266EX\nFeatures: WiFi\nCrystal is 26MHz\nMAC: c4:5b:be:dd:aa:41\nUploading stub...\nRunning stub...\nStub running...\nConfiguring flash size...\nAuto-detected Flash size: 4MB\nFlash params set to 0x0040\nCompressed 489904 bytes to 339169...\n\rWriting at 0x00000000... (4 %)\rWriting at 0x00004000... (9 %)\rWriting at 0x00008000... (14 %)\rWriting at 0x0000c000... (19 %)\rWriting at 0x00010000... (23 %)\rWriting at 0x00014000... (28 %)\rWriting at 0x00018000... (33 %)\rWriting at 0x0001c000... (38 %)\rWriting at 0x00020000... (42 %)\rWriting at 0x00024000... (47 %)\rWriting at 0x00028000... (52 %)\rWriting at 0x0002c000... (57 %)\rWriting at 0x00030000... (61 %)\rWriting at 0x00034000... (66 %)\rWriting at 0x00038000... (71 %)\rWriting at 0x0003c000... (76 %)\rWriting at 0x00040000... (80 %)\rWriting at 0x00044000... (85 %)\rWriting at 0x00048000... (90 %)\rWriting at 0x0004c000... (95 %)\rWriting at 0x00050000... (100 %)\rWrote 489904 bytes (339169 compressed) at 0x00000000 in 38.2 seconds (effective 102.7 kbit/s)...\nHash of data verified.\nCompressed 1024000 bytes to 1374...\n\rWriting at 0x00300000... (100 %)\rWrote 1024000 bytes (1374 compressed) at 0x00300000 in 0.1 seconds (effective 64181.7 kbit/s)...\n\nA fatal error occurred: Timed out waiting for packet header\n'