In case you need to factory reset your M15 SC handset, please press the following sequence of keys:

• Page:
  2.10.32.4da7 / 1.38.65
• Page:
  2.10.46.adad / 1.38.71
• Page:
  2.10.52.5853 / 1.38.71
• Page:
  2.10.54.0088 / 1.38.72.2
• Page:
  2.11.0.4 / 1.38.75-0
• Page:
  DECT M-SC-Series Firmware
• Page:
  How to factory reset an M15 SC handset
• Page:
  How to Register a M15-SC to the M200-SC
• Page:
  M15 SC