Entering mode engineering on Mi A2 - Xiaomi Mi A2 / 6X Questions & Answers

Hello, a few days ago I made the A2, I use Claro and Movistar, now I want to change the bands, according to this web: https://www.hardreset.info/devices/xiaomi/xiaomi-mi-a1/codes/
1. Tap "* # * # 64663 # * # *". In QC test you can perform one of tests for example bluetooth, camera, sensors itp. .
But it only shows me the information of a SIM1 .. I want to make the changes in SIM2, someone knows what happens, greetings friends.
JC

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Call ended xt1103 in Brazil. Rádio? Frequency?

need urgent help my xt1103 every time I dial it appears "call ended" and then drops the carrier signal when I go on the menu * # * # 4636 # * # * and place "only lte" I can send sms and navigateon the internet but still not make calls, I think the problem is in the band based on the frequency of data, my carrier is VIVO, other operators appears only "no service" already installed customroms and stock in other countries but does not solve, flash other radios and still going, someone can discover what is it? or me through the original radio and baseband nexus 6 xt1103 and how to configure it?... Need a lot of help here in Brazil does not have support for the Nexus 6
VIVO work in 850/1900; 850/1800/1900; 850/900/1800/1900
Rooodrigooo182 said:
need urgent help my xt1103 every time I dial it appears "call ended" and then drops the carrier signal when I go on the menu * # * # 4636 # * # * and place "only lte" I can send sms and navigateon the internet but still not make calls, I think the problem is in the band based on the frequency of data, my carrier is VIVO, other operators appears only "no service" already installed customroms and stock in other countries but does not solve, flash other radios and still going, someone can discover what is it? or me through the original radio and baseband nexus 6 xt1103 and how to configure it?... Need a lot of help here in Brazil does not have support for the Nexus 6
VIVO work in 850/1900; 850/1800/1900; 850/900/1800/1900
Click to expand...
Click to collapse
Sometimes this works for me. Power phone completely off. Wait a minute, then power back on.

[Q] Ghanging BandMode

Hi, guys. I installed OmniROM 5.1.1. There is no normal engineer mode on our phones. How we can change bandmode of GSM? Of cause, there are EuroBand, USABand and etc... But some frequencies don't work in my region, for example. What're we be able to do in this case?
@by_rofl_alex
If your phone is destined for your country region than why you asking about this? Device should automatically scanning for gsm band which is supported by your operator and connect to closer signal tower. In hidden menu (on stock firmware) MAYBE you was able to select frequencies per band, like 850/900/1900/2100 but phone normally do this automatically after modem starting (booting phone or turning off airplane mode).
Look here if you're advanced user, maybe you find something http://forum.xda-developers.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059
Edit: I attached application from I9100 CM (of course full credit for team CM) which working on Ace 2 LP ROM, so should working on S3 Mini as well.
Try install as normal app or push to system/app chmod 644, reboot phone.
How to use?
In dialer type:
*#*#197328640#*#*
Go to DEBUG SCREEN > PHONE CONTROL > NETWORK CONTROL > BAND SELECTION > AUTOMATIC (scan all available frequencies) or choose one from WCDMA BAND (900/1800/2100) or GSM BAND (850/900/1800/1900).
Don't know if change's are saved after reboot.

No LTE with one sim card in the divice

MI 5 with latest lOS and latest firmware.
In the Netherlands MI5 doesn't support all the LTE bands . But in general it doesn’t give many problems. Only on the country site it’s sometimes difficult.
However it's strange that I can receive no LTE at all if there is only one SIM card in my phone. I tried everything but H+ is the best I can get. Even if I change the settings in * # * #4636 # * # * I can’t use LTE.
Anyone a solution?
And yes, I know. Just put in two cards and the problem doesn't exist.

Network issues

Greetings,my mobiles Network doesn't show any 4G signal it shows E,H and cannot be used since I'll updated to 12.5.1,and yet I'll already change my simcard to my others phone,it works and the network are perfectly fine but when I'm switching my sim card back to my redmi 9 device it's still have the same problem
MR_SENPAI_21 said:
Greetings,my mobiles Network doesn't show any 4G signal it shows E,H and cannot be used since I'll updated to 12.5.1,and yet I'll already change my simcard to my others phone,it works and the network are perfectly fine but when I'm switching my sim card back to my redmi 9 device it's still have the same problem
Click to expand...
Click to collapse
Try typing *#*#4636#*#* into your dialer and trying to turn on 4G that way if it's off.
svetius said:
Try typing *#*#4636#*#* into your dialer and trying to turn on 4G that way if it's off.
Click to expand...
Click to collapse
if this method is not working, install force lte app then set to lte only option...
I found the settings,what should I do?
My phone frequently changes from the 4G network to the 2G network (E)
I have tried to change from the networking menu * # * # 4636 # * # * to force, but in the end it returns to the same GSM / WCDMA / LTE configuration and the error persists.Any solution?

Redmi 9 Network

My phone frequently changes from the 4G network to the 2G network (E), and sonetimes lost the signal.
In my position, the mobile signal is very good. So...
I have tried to change from the networking menu * # * # 4636 # * # * to force, but in the end it returns to the same GSM / WCDMA / LTE configuration and the error persists. Any solution?
manu0008 said:
My phone frequently changes from the 4G network to the 2G network (E), and sonetimes lost the signal.
In my position, the mobile signal is very good. So...
I have tried to change from the networking menu * # * # 4636 # * # * to force, but in the end it returns to the same GSM / WCDMA / LTE configuration and the error persists. Any solution?
Click to expand...
Click to collapse
sorry i am indonesia, very hard language english for me
xda justice me ,warning use indonesia language
in call use *#*#3646633#*#*
you will get menu
select band
sim1 is simcard 1, frequenz band were very strong in your locations
hckbkl said:
sorry i am indonesia, very hard language english for me
xda justice me ,warning use indonesia language
in call use *#*#3646633#*#*
you will get menu
select band
sim1 is simcard 1, frequenz band were very strong in your locations
Click to expand...
Click to collapse
Ok ok. I understand it. Thank you

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