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[Tools, Tips & Tutorials] [Work in Progress] Trying to Unlock Bands (Including B20)

[ Promote]
111621 259 |
19:39, Mar-16-2016 | From PC
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Go to reply no.
This post was edited by Ultrametric at 15:58, Mar-31-2016

[Work in Progress] Trying to Unlock Bands (Including B20)


Disclaimer
I am not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed. Please do some research on your own before performing this!
YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.

UPDATE!

Conclusion

Changing the NVRAM values, may be the first step in the right direction, but it's not the end. It needs more than this to enable B20 and more.

About the test
Test-Setup:Xiaomi Mi5, In Norway where carriers use Band: 3, 7, 20; Band 20 is for rural areas; Band 3 and 7 are for crowded places
How did I test the NVRAM values: All but Band 20 were disabled, and I drove out to the countryside (rural area)
Result: No Band 20!
Conclusion: The NVRAM values are a good start, but not enough to enable more LTE operating frequencies.

Short Documentation: A short documentation of the performed test.

Introduction
This topic is work in Progress; I  edited some NVRAM values in hopes to unlock more bands for the Xiaomi Mi5. Have a look at the following topics.

Original Bands
4G        FDD-LTE bands 1 / 3 / 7
4G        TDD-LTE        bands 38 / 39 / 40 / 41

Related Articles:
Topic 1: How to unlock LTE frequency bands for the Mi Note Pro
Topic 2: Qualcomm NVRAM Settings & 2G/3G/4G LTE Band Config
Topic 3: Xiaomi Mi5 Qualcomm Diagnostic Drivers (Xiaomi Diag Drivers)

Topic 1: How to unlock LTE frequency bands for the Mi Note Pro
Read this article; download the Qualcomm Tools; Get information on how to use these tools.

Topic 2: Qualcomm NVRAM Settings & 2G/3G/4G LTE Band Config
This guide is based on information from this article. I highly suggest you read this. Values are copied from this topic.

Topic 3: Xiaomi Mi5 Qualcomm Diagnostic Drivers (Xiaomi Diag Drivers)

Windows 10 64Bit drivers for the Qualcomm diagnostic stuff.


The Important Line:
  1. ID        Desc                Original Value        Modified Value
  2. 06828        lte_bc_config        2061584302149        2061719111903
Copy the Code




What will happen next?
4G works on Band: 3, 7 and 20 in Norway. Usually, Band 20 is used in rural areas, and Band 3,7 are in use for more populated areas. As I live in Tromsø, I had 4G out of the box.
So I will have to go out of the city, to test if Band 20 is active, after changing the NVRAM values, on my Xiaomi Mi 5.

Why post this now and not wait a bit?
Maybe there's a mistake in here, and someone has the time to find it.



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14:50, Jul-18-2016 | From PC
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This post was edited by nforce4 at 15:00, Jul-18-2016

I  check mi5 RF NV files.

unfortunately mi5 cannot support band20

only support B1 2 3 4 5 7 8 11 17 18 26 28 38 39 40 41

these is no band 20 configuration in mi5 NV files ,

even if  set band 20 in  lte_bc_config ,unlock band 20,
but actually not support,

you cannot use search band20 signal



mi5.jpg



小米5支持频段.png

band5.jpg



小米5支持频段.png

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18:43, Jun-29-2016 | From PC
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zuk z2 has also snapdragon 820 and has lte band 20 support..maybe we can use its confs to use on mi5?

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18:49, Nov-24-2017 | From PC
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Hey guys,
does that screenshot mean I managed to unlock B20 in my RN4X (2016101)? Is signal guru app good proof? I'm in big city now, so B3 is working nice, I'll try to catch B20 band in some rular area. That would be definite proof.
Screenshot_2017-11-24-11-43-25-361_com.qtrun.QuickTest[1].png

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16:57, Jul-22-2016 | From PC
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Europe LTE band in the vast majority are not attractive for Chinese producers. Europe is a small market.

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06:10, Apr-11-2016 | From PC
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we want b20! :D

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 Author| 19:39, Mar-16-2016 | From PC
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This post was edited by Ultrametric at 01:32, Mar-24-2016

Why have this value?


If you look at it in binary, each 1 represents an active 4G band. So by changing values from 0 to 1, in theory, additional frequencies are enabled. (Only if the hardware allows it.)
  1. lte_bc_config (64-bit, of which 44 bits relevant):                Bands Active:
  2. 2061584302149        00011110000000000000000000000000000001000101        1.3...7.             38-41
  3. 2061584892127        00011110000000000000000010010000000011011111        12345.78    17 20    38-41
Copy the Code
How can you help?
Double check the numbers and share your knowledge, pretty please. If something looks fishy to you, ask a question.
MTK has an engineering mode where it's easy to see what bands are enabled. Is there something similar to the MTK engineering mode for Qualcomm SoC's? Is there an easy way to test enabled bands?

What hardware is inside of the phone?
(Just another wild guess, be careful)
I googled a bit, instead of learning Norwegian and found the following. Link: Intrinsyc Introduces Qualcomm Snapdragon 820 Cortex-A72-Class Development Board, SoM and MDPs
How did I stumble upon this, I read on en.miui.com that the SD 820 has Qualcomm WCD9335 audio codec, and so found that link.
In the link a as connectivity the following hardware is stated: Qualcomm IZat Gen 8C GPS (WGR7640); and googling for this brought up that the same chip (WGR7640) is used in the SD 410.

One phone that has the SD 410 is the MOTO G (2015); so that allows us the very wild guess that the SD 820 will support at least all the bands of the SD 410.

Please share your opinion on this matter. (And consider the possibility that I am 100% wrong with the here stated assumptions.)
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20:21, Mar-16-2016 | From PC
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Wish you a success. Good luck! I keep fingers crossed:]
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01:57, Mar-17-2016 | From PC
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i hope that you will be success

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03:59, Mar-17-2016 | From PC
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GL man !

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22:45, Mar-20-2016 | From PC
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Hopefully we will get some official support of Band 20 of 4G, so you don t have to hack your firmware to get this running. :-)

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 Author| 22:55, Mar-20-2016 | From PC
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This post was edited by Ultrametric at 22:57, Mar-20-2016
oberbula replied at 2016-3-20 22:45
Hopefully we will get some official support of Band 20 of 4G, so you don t have to hack your firmwar ...

This unlock has nothing to do with the Firmware.


This whole thing happens on a much deeper level. (These changes are not revertable, by applying a recovery update or a flash_all update of a MIUI firmware).

And further on there won't be official support. As the Mi 5 will not be launched globally, according to Hugo Barra.
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Mi Power BankSummer Mi BunnyI Love Mi BunnyMi Bunny Game Master

01:27, Mar-21-2016 | From PC
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Thank you for the huuuge work!
My provider mainly uses 800MHz where i live, and unlocking Band20 in some ways would be amazing!
Diehard Italian Android Lover!

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01:56, Mar-21-2016 | From PC
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all the best

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18:10, Mar-21-2016 | Via mobile
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Thank you ;-) but that work ?

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