Invalid IMEI Error - Android Phone

I got this error after i flush the ROM. The only solution is to write it back, so this is what i tried.

Before anything else, note down the imei of your phone - you can find it under the battery.

Write/Change IMEI:

OPTION 1: (Without Using Computer)

1. Open Dialer
2. Dial *#*#3646633#*#*
3. Under Connectivity, Click "CDS information"
4. Radio Information
5. Select Phone1 (SIM 1)
6. Click AT+
7. Type AT+EGMR=1,7,"YOUR SIM1 IMEI HERE"
8. a message popup "Sent"
9. Reboot you phone
10. Repeat step 1-4
11. Select Phone2 (SIM 2)
12. Click AT+
13. Type AT+EGMR=1,10,"YOUR SIM2 IMEI HERE"
14. a message popup "Sent"
15. Reboot you phone

If you encountered problem from the above procedure like:

•  Nothing Happens after you dial those #'s.
• You cannot find CDS information Tab.

Then, follow procedure below.

OPTION 2: (Computer Unit is needed)

1. Root your Phone (See Rooting Android Phone Procedure here)
2. Download MTK_IMEI_Write_Tool to your computer
3. Open the file
4. Press "Y"
5. Enter IMEI1
6. Enter EMEI2
7. Press any key to exit
8. Open the folder where you save the IMEI_Write_Tool, You can see there the IMEI.bak
9. Connect your phone to your computer, then copy the IMEI.bak to SDCARD
10. Download Mobile Uncle Tool to your phone.
11. You may disconnect your phone from the computer now.
12. In Phone, Install mobile uncle tool
13. After installation, Open Mobile Uncle
14. Click Backup/Restore EMEI
15. Click Restore from SDCARD
16. If success, Reboot you phone

That's all