[Lenovo K6 / K6 Power / K6 Note Guides, News, & Dis] Sreeom:
This is Quite a VERY Long Trick.

I actually have undergone, such a situation on my Lenovo K6 Note (K53a48)

That The Sim 2 didint worked at all! And and once I reboot, The Sim 1 also went away :-|

I was stuck. I actually didn't liked the Nougat Version On Vibe Ui on K6 Note (karatep) so I decided to downgrade back to Marshmallow, as Marshmallow was more stable than Nougat (in the case of Lenovo K6 Note).

After downgrading, I found SIM 2 network always remained DEAD! But in Nougat, SIM 2 was working fine. I thought this might be a operator problem, but Naa! I changed the sim to My another phone and VOILA! it was working!!

Then , inorder to avoid this issue, as I needed both the sims to work, so I again upgraded back to NOUGAT (this time Via OTA update)

And after updating to the LATEST of it,

Now BOTH SIMS NETWORK WERE DEAD!!

Upon this , I thought of researching and finding out a problem to this. As I knew , the hardware is actually capable of, and this was a software driven issue.

I researched, researched and finally got something.

The process I Got from XDA was something like this :

Firstly you have to have adb & fastboot on your computer.

Then plug your phone on computer

Open adb and type:

-- adb reboot bootloader(it boots in fastboot)--

Then type:

-- fastboot erase modemst1 and

Then, -- fastboot erase modemst2

Then, -- fastboot erase cache and

Then -- fastboot reboot

After doing this, I came to know that my Baseband has successfully been reset/formatted back to its default stage, and it should work.

But no! Still both sims were dead!

Now again, I researched, researched, and again found something:

On XDA-

1, Go To Mobile Setting select <notification centre> select <status bar icon> select volte

2, dial *#*#4636#*#* select volte enable

3, ####682# select <IN> option &

Click ok select after which,

Phone will auto reboot and check your phone for VoLTE.

Still this didn't worked!! This was HORRIBLE!

As After typing ####682# -

I was getting "Attention:

Error: Could not read factory ota patch from sd card or the patch is not correct"

Now , I after reading this OTA error, I thought of giving a Last try.

I downgraded back to MARSHMALLOW, and again,

Tried Resetting my BASEBAND version by using this:

--------------------------------------------------

Firstly you have to have adb & fastboot on your computer.

Then plug your phone on computer

Open adb and type:

-- adb reboot bootloader(it boots in fastboot)--

Then type:

-- fastboot erase modemst1 and

Then, -- fastboot erase modemst2

Then, -- fastboot erase cache

Then -- fastboot reboot

--------------------------------------------------

After this, again

I tried the USSD code method that is:

--------------------------------------------------

1, Go To Mobile Setting select <notification centre> select <status bar icon> select volte

2, dial *#*#4636#*#* select volte enable

3, ####682# select <IN> option &

Click ok select after which,

Phone will auto reboot and check your phone for VoLTE.

--------------------------------------------------

And YES VOILLLAAAA!!!!!

BOTH SIMS worked. Yes.

Sim 1 was working Along with VoLTE and Sim 2 was back on Network. ! .

After this I again upgraded back to NOUGAT via OTA, and yes all SIMS worked.

Yes guys, the conclusion is,

If your 2nd Sim or You have any problem with SIM network,

You must do the following two steps, and yes it will surely work.

That is, First Reset The Baseband via ADB

Second, Use the USSD code method after resetting Baseband.

---- Provided you must be on Marshmallow Firmware, or Downgrade back to it first, and then try. ----

This METHOD works for:

• Lenovo K6 Note (K53a48) (karatep)

• Lenovo K6 Power (K33) (karate)

Hope this helps.

Thanks for reading.

~~@Sreeom Sahoo