I am using Samsung galaxy ace gt-s5830i, and suddenly the phone has lost its IMEI number that I can not recover for days. I am not very knowledgeable about Android OS and would really appreciate your help.
I updated it OS to Jelly Bean, to see whether it will solve the problem. However, it did not.
1. I would like to know how I can re-install its official version Android v2.3.6 without Kies or ODIN (may be by using sdcard, but how?), since the SIM card is not found on the phone due to no IMEI, I can not connect it to my computer.
2. How can I recover IMEI.
I would be very grateful for your help.