failed to open config file for writing

 ets Jan  8 2013,rst cause:1, boot mode:(3,6)

load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v614f7c32
~ld

   Sonoff DC:4F:22:2B:E6:B5 startet... (FW: 1.0.27)
Config-Modus durch bootConfigMode aktivieren?
-> Nein, SPIFFS mount fail!
loadSystemConfig mounting FS...
loadSystemConfig failed to mount FS
ssid = xxx, psk = *************
*WM: Adding parameter
*WM: sonoffmodel
*WM: Adding parameter
*WM: ccu
*WM: Adding parameter
*WM: loxudpport
*WM: Adding parameter
*WM: sonoff
*WM: Adding parameter
*WM: hmpowervariable_pow
*WM: Adding parameter
*WM: hmecvariable_pow
*WM: Adding parameter
*WM: custom_powermeasureinterval_pow
*WM: Adding parameter
*WM: restorestate
*WM: Adding parameter
*WM: leddisabled_switch
*WM: Adding parameter
*WM: gpio14mode_switch
*WM: Adding parameter
*WM: custom_gpio14assender_switch
*WM: Adding parameter
*WM: backendtype
*WM: Adding parameter
*WM:
*WM: Adding parameter
*WM: custom_ip
*WM: Adding parameter
*WM: custom_netmask
*WM: Adding parameter
*WM: custom_gw
*WM: Configuring access point...
*WM: no-net
*WM: SET AP
AP-Modus ist aktiv!