Dear all,
I trying to change my CSC from MWD to XEF on my S20 Ultra LTE Android 11 UI 3.1 Security patch September 1st and tried following:
  • ODIN : PASS, recovery clean cash and factory reset, reboot CSC still MWD
  • *#243203855# : said IHM non valid !!!
  • *#272*IMEI# : not working
  • Downgrade to Android 10 : not possible from 3.1 to 2.1


I have and ESIM activated and a sim from home CSC and any SIM card from target CSC

Still anything to try and having the CSC changed ?
Thanks a lot in advance
Amine