How to Fix Invalid IMEI - Unknown Baseband

How to Fix Invalid IMEI - Unknown Baseband

I got this problem with my phone's IMEI, what is responsible for this?

One must know the exact reason why you are stuck with the stated question. That kind of things occurs once you lack the so called "carefulness". You must practice yourself to back-read the comments of other users for a specific tweak/application you are trying to run as what you are doing is a kind of suicide for your phone.

To this IMEI problem, it's a bit impossible for it to exist on an untouched Stock ROM version. This case is one of the troubles you can possibly encounter once you have root-tasks performed such as trying out tweaks or installing custom ROMs. These tasks could mess some part of your phone's system that eventually leads to corrupted OS.

Also Read: How to make android scatter file

Unknown IMEI and Invalid IMEI

It may look identical but somehow it gives us a clue on what could be the source of the problem. If your phone is showing Invalid IMEI, it is more likely you just have to replace a working IMEI for your device. While on the other hand, Unknown IMEI seems to be a bigger problem, usually the Baseband as well is read Unknown. The corrupted baseband leads to the lack of communication feature of the phone.

How do I solve it?

By following the methods below, hopefully we could end up fixing your phone's IMEI and Baseband and for you to continue doing calls and sending SMS.

How to Fix Invalid IMEI

Caution: Always remember that root-related actions are your sole responsibility.

Requirements:

• MTK-based android phone in hand
• Root access
• IMEI number

*  You can find it by removing the back cover of your phone and look for IMEI 1 for SIM 1 and IMEI 2 for SIM 2.

*  it is also written on the box

*  No luck? use the IMEI from the same phone

Step 1:

1.    Head to Engineering Mode

o    Dial *#*#3646633#*#*

o    If the above dial doesn't work, download and install MTK Droid Tools. Open it, select Engineer Mode -- Engineer MTK.

2.    Go to Connection tab

3.    Select CDS Information

4.    Now, select Radio

5.    Select the SIM which you want IMEI to be fixed.

6.    Input the following:

For SIM 1, at the AT+ line, make it look like this (replace the red text with your phone's SIM 1 IMEI number):

AT+EGMR=1,7,"SIM1_IMEI_NUMBER"

For SIM 2:

AT+EGMR=1,10,"SIM2_IMEI_NUMBER"

   
  7.  Press SEND AT COMMAND to send and save the IMEI.
     8.  The panel will close automatically. If you are done, reboot your phone.

Step 2:

==  Download and Install Terminal Emulator on your device

==  Open Terminal Emulator 

==  Type SU then press Enter

==  If asked for Superuser permission, grant it.

== Then, type the following command then press Enter.
echo 'AT+EGMR=1,7,"IMEI_NUMBER"' >/dev/pttycmd1
echo 'AT+EGMR=1,10,"IMEI_NUMBER"' >/dev/pttycmd1

==  Restart your phone.

How to Fix Unknown Baseband and IMEI

If you have done replacing your phone's IMEI using the given method above but still it won't work and also the Baseband was still unknown, follow the steps below...

N/B: if you are carrying out these procedures you are doing it on your own risk.

Requirements:

• MTK phone
• Root access
• Windows computer
• MTK Droid Tools
• IMEI Number - written at the back of your phone (remove the back cover)
• Android USB ADB drivers
• NVRAM backup from other device with the same model
• Sorry but this is the only safest way. You can comment your phone model so I can help you look for it. Once you had the NVRAM backup, copy it in your computer

Procedures:

a)   Download MTK Droid Tools and extract it on your computer running Windows OS

b)   Download and install USB ADB drivers

c)   Enable USB debugging on your phone (go to Settings -- Developer options) and connect to your computer using USB cable.

d)   From your computer, open MTK Droid Tools application.

e)   The tool should detect and display your phone information.

f)     Click the ROOT button for temporary Root shell access on your phone.

g)    

h)   Click on IMEI/NVRAM

i)     Click Restore button, and then select/open the NVRAM backup that you got.

j)     Change IMEI, input the ones you have.

k)   Then click Replace IMEI

l)     Restart your phone.

m)  finished

Source: XDA and to the developers of the apps we used.