Looks better: Flash successful.
But:
Dir dir = SPIFFS.openDir("/spiffs");
Serial.println("Dateien im Verzeichnis:");
while (dir.next()) {
Serial.println(dir.fileName());
}
doesn't show any files....
@martinayotte:
You are sure, the offset = 0x6b000h???
512k-64k is IMHO 0x70000h. If I assume, that the SPIFF-area is at the end of the flash
ESP8266 Arduino add-on
Arduino IDE 1.6.5