Hochladen auf arcucam board schlägt neuerdings fehl

Seit kurzem schlägt das Hochladen der sketches für mein board "arducam esp8266 uno" fehl.
Zuvor ging es aber mindestens 10x gut.
Folgende ausführliche Meldung wird angezeigt.

C:\Users\dmk\AppData\Local\Arduino15\packages\ArduCAM_ESP8266_UNO\tools\esptool\0.4.8/esptool.exe -vv -cd nodemcu -cb 115200 -cp COM4 -ca 0x00000 -cf C:\Users\dmk\AppData\Local\Temp\arduino_build_215927/Blink.ino.bin 
esptool v0.4.8 - (c) 2014 Ch. Klippel <ck@atelier-klippel.de>
	setting board to nodemcu
	setting baudrate from 115200 to 115200
	setting port from COM1 to COM4
	setting address from 0x00000000 to 0x00000000
	espcomm_upload_file
	espcomm_upload_mem
	setting serial port timeouts to 1000 ms
opening bootloader
resetting board
trying to connect
	flush start
	setting serial port timeouts to 1 ms
	setting serial port timeouts to 1000 ms
	flush complete
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	read 0, requested 1
trying to connect
	flush start
	setting serial port timeouts to 1 ms
	setting serial port timeouts to 1000 ms
	flush complete
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
Uploading 223648 bytes from to flash at 0x00000000
Beim Hochladen des Sketches ist ein Fehler aufgetreten
	erasing flash
	size: 0369a0 address: 000000
	first_sector_index: 0
	total_sector_count: 55
	head_sector_count: 16
	adjusted_sector_count: 39
	erase_size: 027000
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	setting serial port timeouts to 15000 ms
	read 0, requested 1
	setting serial port timeouts to 1000 ms
warning: espcomm_send_command: didn't receive command response
warning: espcomm_send_command(FLASH_DOWNLOAD_BEGIN) failed
closing bootloader
	flush start
	setting serial port timeouts to 1 ms
	setting serial port timeouts to 1000 ms
	flush complete
error: espcomm_upload_mem failed

Als IDE verwende ich Arduino IDE 1.8.5.

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