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[Tools, Tips & Tutorials] [UPDATED/KENZO] Solve problems with 4G/LTE (ROOT)

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10:19, Aug-25-2016 | From PC
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Go to reply no.
This post was edited by Vasmitos at 22:23, Sep-15-2016
TESTED ON: Redmi Note 3 Pro/Kenzo

Problem: phone does not connect to 4G (sim 1)
The phone has no 4G signal in two sim cards
the network is falling or not connect at 3G mode (H+)
Explaining the problem:
Some CHINESE vendors to distribute SHOP ROM, install a modified QCN (Chinese baseband)
The QCN is the phone's IMEI file that has data and other information related to RADIO.
what happens ...
This QCN is blocked 4G in main IMEI (not know pq not the secondary IMEI) or cause issues, block calls, etc ... for most non-Asian countries
For this reason, when configuring the unit to another location (eg, Brazil, Europe, etc) this  block 4G / LTE networks access

IMPORTANT: DO AT YOUR SOLE RISK. The TUTORIAL INVOLVE ESSENTIAL FILES MANIPULATION FOR THE FUNCTIONING OF CELLULAR NETWORK. ANY ERRORS, MAY RESULT IN FAILED CONNECTION / NETWORK. THIS TUTORIAL CHANGE MEID.. IF YOU NEED MEID (CDMA) DOESNT USE IT
  Please reply to view this thread.

IMPORTANT: ONLY TESTED ON RN3P (SNAPDRAGON)
do not know if rolls on other devices, due to the QCN model.
Forced Reply to see cause i need feedback to adjust this tutorial and find solution to another model of smartphones
I believe together we can fix this for all models, and xiaomi devs see this to make a easy step solution


Please pass feedback and only if you do what you're doing CERTAINTY
thanks for @BharatG and @Archelot (from MIUI forum) and vkass from XDA forum


PICS WITH 4G Working HERE
Flashed 4 different Roms (xiaomi.eu, RR, EPIC, Global oficial)
All works fine
get_thumbnail.jpg







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Rated by 44 people   Experience Reason  

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Xiaomi 7th Anniversary

13:06, Oct-17-2016 | From PC
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I'd like to say that this didnt solve me only the problem with chips, but my wifi problem too!!!

I've installed cm13 rom and my wifi was sucking and my sims wasnt working at all. Then I've installed banmeifyouwant's cm radios so my sims were working again, but unfortunately my wifi was still sucking.

Now everything is ok as when I was using miui 7.

Thank you thank you thank you thank you thank you a milion times. I've read many texts on net but you solved my problem with that bin of yours. Thank you!

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04:59, Dec-30-2016 | From PC
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Thnx i will gonna try this

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15:05, Nov-19-2016 | From PC
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tq bro..works well

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15:41, Oct-18-2016 | From PC
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finally,,, i'll try to fix 4G in my Note 3.. :D

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14:00, Oct-16-2016 | From Redmi Note 3
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thanks man, it's work but my fingerprint is not working now, what should I do to fix it without losing data and app on internal memori

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07:29, Oct-16-2016 | From APP
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not complicated, very usefull...thanks for sharing

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21:23, Sep-07-2016 | From PC
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thank you so much..my redmi note 3 4g is alive..after 2nd attempt

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00:01, Sep-07-2016 | From PC
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thank you, i will try

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20:17, Sep-06-2016 | From PC
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Vasmitos replied at 2016-9-6 07:21
EDIT: If you expecting issues
try to flash this archive before make the tutorial
https://goo.gl/WV ...

Good News today!
I have turned off the device and insert my sim on slot 2 and after a few minute i have 4g without change anything...
I don't know if the turn off is the solution. When my wife come back at home, test with the sim 1 if the problem is solved...

On the instruction add on setting of QPST the creation of the port COM21 for my phone or check in device management your number.

Thanks!

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15:43, Sep-04-2016 | From PC
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This post was edited by dacts at 16:06, Sep-04-2016

thanks  for the tutorial, I get 4G network now, but my fingerprint scanner has stopped working
EDIT:

nevermind, I reflashed the global stable MIUI rom via fastboot , everything works fine now.

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11:14, Aug-25-2016 | From PC
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This post was edited by Kaputy at 11:17, Aug-25-2016

Congratulations igor , I'm glad you made ​​it. I'm sure it will help many people.

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 Author| 21:42, Aug-25-2016 | From PC
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This post was edited by Vasmitos at 22:21, Aug-25-2016
Kaputy replied at 2016-8-25 11:14
Congratulations igor , I'm glad you made ​​it. I'm sure it will help many people.

thanks man

a lot of people has this problem (shop rom and chinese vendors make the thinks so bad, modifying things inside original system)
after it, i hope xiaomi saw this topic and put a fix in next MIUI updates

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09:56, Aug-26-2016 | From PC
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getprop sys.usb.config<div></div>
I get syntax eeor '<' unexpected

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10:11, Aug-26-2016 | From Redmi Note 3
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thanks

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 Author| 11:20, Aug-26-2016 | From PC
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1628997827 replied at 2016-8-26 09:56
getprop sys.usb.config
I get syntax eeor '

Edited

setprop sys.usb.config diag,adb

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21:14, Aug-26-2016 | From PC
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nice..thanks for sharing. this will be help other miui user for get back LTE

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22:21, Aug-26-2016 | From PC
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Well gonna try that later.my phone came with 7.1.99.99 and had only 2g and worked with all miui ROMs this way.hope this solves my half year problem.weird part is how devs didnt saw this problema about those vendor ROMs or patches to fix in update or recoveries...

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 Author| 22:38, Aug-26-2016 | From PC
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skrillerz replied at 2016-8-26 22:21
Well gonna try that later.my phone came with 7.1.99.99 and had only 2g and worked with all miui ROMs ...

your phone arrive with shop rom?!
shop rom has a lot of problems...
MIFLASH doesnt flash all archives (such persist.img and qcn) with modified, make cell work halfly

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Mi WiFi Router Mini

22:58, Aug-26-2016 | From PC
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This post was edited by skrillerz at 23:01, Aug-26-2016

Yes it came.came from gearbest.with 7.1.99.99.Well in my case only 2g works properly if select 3g network appears but no sms/calls/internet and 4g appears emergency calls only.had once h+ in miui 8 China beta but only lasted once untill reboot.have tried every rom with no success.in your thread it May fix it because ROMs doesnt change imei properties so um going to try this later.or you have any tips for those vendor roms?thanks in advance

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