yashsingh1/xdaforums huggingface dataset:
[Xiaomi Mi 5 Guides, News, & Discussion] iHack13:
So there is no possibility to overwrite a non used Band in favor for the B20? Or maybe not overwrite, since the dedicated ICs have pinouts for the dedicated bands, but rather force the B20 Signal through the path of an unused band that you can disable?

Not sure if that makes any sense. But I expect this to be a no, since spoofing the Bands seems impossible.

As a very very last Option

Even considering the worst case scenario that there is no open unused contact for B20 it seems its not impossible to establish connections since the ICs arent BGA. I see the SKY13492 is MCM package and you could get a wire to the B20 Pin.

Same goes for SKY77646-51. However this one lacks a proper datasheet.

Also I have a Mi5S and no current use for B20 and I hope this will stay so (just got 2 a year 3g contract, but you never know because of the second SIM slot :)). But this hardware mod definitely keeps the future bright, when the phone gets old thats when I might try to open it up and tinker with it.

By then hopefully there will be a Mi5S schematics pdf. Since there is none currently. And am Not getting the hopes high that the mi5s is different from the mi5 in this case. Pretty sure that no hardware connections on this one either.
[Xiaomi Mi 5 Guides, News, & Discussion] greasymonkey1960:
It is not the Android 7 that is locking the EDL, as I am using Android 7 (7.4.27 Weekly Dev miui.EU ROM) on a Mi5, and can happily edit NVRAM values, both via QXDM Pro and using QPST to generate new .qcn files and do a complete or partial re-write of the NVRAM.

Cheers,

GM.
[Xiaomi Mi 5 Guides, News, & Discussion] darkguy2008:
Hey all, long-time lurker here with an OnePlus 2 US device with Band 7 which I need to use in Band 3 in Costa Rica for LTE.

I've been reading all the pages from page 40 or something, and, excluding my lack of RF knowledge, it seems that you guys need to work some calibration curves/values in order to get your bands in your phones, right? This is, we are having the same issue with OP2 so I'm thinking that maybe I could make an app that could allow you to visually edit NV values, more specifically curves and data ranges, so that your R&D is better?

In short, I've been tinkering with QRCT and the QCN/XML files and I figured I could make a parser/editor for XML files which you can convert to QCN later... the current tools are a bit crappy, and editing value ranges isn't as exciting or helpful as viewing a diagram you can interactively edit. Since I'm struggling a bit with debts the project would run off donations, but I think that it will be an useful tool for you guys to edit those darn QCN files better. What do you think? will it be useful? :)
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Firtst of all we need hardware changing.
[Xiaomi Mi 5 Guides, News, & Discussion] darkguy2008:
For some cases, yes. I did read that there was one band that was overlapping an already existing band range, so if someone with RF experience can adjust those curves and ranges, it would make it work - maybe with low signal, but it could be improved I guess, no?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
For band 20 we need change some filters and software.
[Xiaomi Mi 5 Guides, News, & Discussion] greasymonkey1960:
Hi, You are correct, the QCN values for the additional bands need to be created, I have been doing this in Excel after parsing data, graphing, correlating, etc, etc.

Whilst it may be a useful "tool" to have, but if I were you, I would not be investing time & effort, since the limitation has been found to be hardware at this time (B20 PA_OUT not connected, no SAW filter, etc).

Cheers,

GM.

---------- Post added 3rd May 2017 at 12:05 AM ---------- Previous post was 2nd May 2017 at 11:59 PM ----------

Band 5 works fine - I am currently in the Philippines working in a network rollout of L850 (Band 5) and doing measurements with a rooted Mi5 (B5 enabled) using NSG, it correlates quite well with the measurements from a Samsung Galaxy S5 which is calibrated for network performance benchmarking.

Cheers,

GM
[Xiaomi Mi 5 Guides, News, & Discussion] lonypny:
Sorry to hijack the thread here... I have a Xiaomi Redmi 4 global version. Is this the same RF hardware? Any way I can check if we're hardware or software limited for band 20 support. Kernel+ROM sources were recently released, if anyone cares.
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Have you a schematic diagram of your phone?
[Xiaomi Mi 5 Guides, News, & Discussion] lonypny:
Where can I find it?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Good question, i dont known.
[Xiaomi Mi 5 Guides, News, & Discussion] MYMY999:
HELLO guys :)

So Nobody has succeeded to unlock b20 on mi5?

somebody try to unlock B20 again?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
We need hardware changing. Would you like to try?
[Xiaomi Mi 5 Guides, News, & Discussion] luismatosdias:
Chaging hardware? What i need to change?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Read please my post on 23 april
[Xiaomi Mi 5 Guides, News, & Discussion] MYMY999:
i think is that post :

for moment i can't try I wait for my mi5 But your method only work whit indian version of mi5 if i understand everything so I could not try.

But if you do a tutorial whit pictures maybe someone whit indian version will try

So whit other version we cant do everithing about B20 ?

AND i find that: ttp://en.miui.com/thread-311977-1-1.html

i wish that can help you

maybe we can unlock b5 in all versions of MI5 then change the hardware for B20
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Not only indian version. Read other posts. Only Software changing dont help.
[Xiaomi Mi 5 Guides, News, & Discussion] MYMY999:
ok i understand better now

When I would have received my MI5 i'm ok for testing it and post my results here but i need more informations if possible whit pictures
[Xiaomi Mi 5 Guides, News, & Discussion] TheUltrametricSpace:
Be aware the following is just another wild guess!

I read up a bit on the PMA and the way I get it is that 2G / 3G / 4G frequencies "overlap" ... in the means of if 3G frequency 800mhz works then also 4G works. (BIG MAYBE, take it with a grant of salt.)

So if the simply lte enable by the lte_... NVRAM value fails and I have time, I am going to double check that e.g. 800Mhz (or the range Band 20 uses) is also enabled in 2G / 3G.

It could be that one of the values is more dominant, dunno. Trial and error will be the way to go.
[Xiaomi Mi 5 Guides, News, & Discussion] Joboy13:
I don't think it's a requirement to have connection to both. Would be strange.

And either way, a 3G modem doesn't recognize 4G data. For the 3G modem, it isn't there. Don't know the other way around tho. You could do some test:

- Everything turned of except for the 4G B20 (so turning off 2G and 3G as well).

- And the 2nd with both 800 MHz turned on (but again, all (2G, 3G & 4G) the others turned off.)

But that's what you were going to do, if I understand you correctly.
[Xiaomi Mi 5 Guides, News, & Discussion] TheUltrametricSpace:
We have no information given, it's a black box. There is no strange.

And no, I did not touch 2G or 3G right now.

What I posted previously is a trial and error method for people who already failed with unlocking. If someone has a lot of time, they could try it.
[Xiaomi Mi 5 Guides, News, & Discussion] tndb:
I think what you mentioned on the miui forums that we might need to take a peek on the modem files aswell. I dont believe for a second that there is some extra hardware stopping us from enabling band 20. CPU and AMP supports it, antennas supports it, what else is there hardware wise that "blocks" it?

Ive still got my Lenovo Zuk Z1 which has a snapdragon 801 and an AMP supporting band 20 so im gonna try changing the flags on this one too and see if that gives any result since its cyanogen software in it.

Edit: Cant manage to keep the phone in diagnostic mode for long enough so stuck at the time being Managed to get it into diag mode persistently, anyway changed the value here aswell but no band 20 coverage on this phone either but could be same thing as other locked phones. Checking *#*#4636#*#* says the network setting is on GSM only per default (in redmi 3 its on "TD-SCDMA, GSM/WCDMA and LTE" as a default setting) but I do have WCDMA coverage at the time and changing back and forth here didnt get me LTE coverage but seems fishy to me

Either way its probably software locked on more than 1 place hence why noone has managed to unlock it "yet"
[Xiaomi Mi 5 Guides, News, & Discussion] twistedh:
I gave in and tried it. One of the networks I use, only has band 20 out where I am. And I don't have 4g...

Hope it works for someone else.

I've double checked the nvram values and only have to change the lte_bc_config right?
[Xiaomi Mi 5 Guides, News, & Discussion] twistedh:
Ultrametric. Can you do me a huge favour and tell me your default values for 00946, 02954, 00441 and 06828.

I may have buggered something up :/
[Xiaomi Mi 5 Guides, News, & Discussion] ventu87:
s7 with the snapdragon 820 have support the band 20! why mi5 not?

I'm sure you can somehow unlock http://xdaforums.com/crossdevice-dev/sony/thread-progress-please-leave-im-updating-t2871269

---------- Post added at 06:08 PM ---------- Previous post was at 06:04 PM ----------

http://www.twd-club.co.il/showthread.php?tid=23722 watch it!!!

http://xdaforums.com/oneplus-one/general/guide-unlock-aditional-bands-qualcomm-t2877031 watch it!

http://xdaforums.com/htc-one-m8/general/unlock-bands-qualcomm-device-phone-t2880239 watch it
[Xiaomi Mi 5 Guides, News, & Discussion] fredda88:
Found something else inside MI5 that supports our goal!

The WTR3925

​

Single Chip CA Solution

WTR3925, the 1st commercial 28nm RF transceiver in the mobile industry, and the fourth generation of multimode LTE transceivers from Qualcomm Technologies, was first to support up to 40 MHz 2-carrier aggregation on a single chip. This new transceiver, paired with latest Qualcomm Snapdragon 800 series processors along with the Qualcomm RF360™ front end solution, is integral to Qualcomm Technologies’ world mode LTE and LTE Advanced solutions for premium tier mobile devices.​

​

https://www.qualcomm.com/products/snapdragon/rf-transceivers
[Xiaomi Mi 5 Guides, News, & Discussion] Joboy13:
Those are for GSM and WCDMA, not for LTE. Not sure if we would ever need them tho.

EDIT: I mean the method, not the bands.

That's interesting. Let's hope that TheUltrametricSpace's test work out this weekend!
[Xiaomi Mi 5 Guides, News, & Discussion] tndb:
I would like to bet that we need to modify NON-HLOS.bin somehow to get band20.

Modem.bin is for 2G/3G and NON-HLOS.bin is for 4G/LTE
[Xiaomi Mi 5 Guides, News, & Discussion] TheUltrametricSpace:
The hardware, SoC and PMA support it.

I just checked your first link, all it does is edit NVRAM values, what is very likely not enough.
[Xiaomi Mi 5 Guides, News, & Discussion] TheUltrametricSpace:
I will, today or tomorrow. Hope it's still of help
[Xiaomi Mi 5 Guides, News, & Discussion] twistedh:
Have you had any luck unlocking band 20?

I tried to turn everything off buy it hasn't made any difference.

I thought I did something wrong because I keep losing signal but I'm certain it's because one of conflicting bands. I. E. I have two sims and when they both try to connect to different frequencies I lose signal. Quite annoying
[Xiaomi Mi 5 Guides, News, & Discussion] Radeon89:
It may not be a bad idea that who is going to test on the field if the band 20 is really unlocked, brings with him also another smartphone, one with the band 20 enabled by default and that allows to check to what lte band you are connected (i.e. LG G2).

This would be helpful to be sure that on the place of the testing, there is the b20 band.
[Xiaomi Mi 5 Guides, News, & Discussion] tndb:
Im up for testing something radical but I might be totally wrong on it aswell.

Im thinking about finding a phone with similar hardware components, one with band 20 and one without band20 support and then use/flash the band20 supported phones NON-HLOS.bin onto the nonsupported band20 phone.

Anyone know or tried this before and if its somewhat safe to do without totally bricking the phone? Ill just make a backup before ofc but no point if it will fry the phone
[Xiaomi Mi 5 Guides, News, & Discussion] juanchopl87:
Lg g5 has snapdragon 820, and similar hardware.

If anyone has lg g5, he can prove that.
[Xiaomi Mi 5 Guides, News, & Discussion] sys01:
[MENTION=6908205]TheUltrametricSpace[/MENTION] im trying to unlock bands but QPST don't recognize my phone even after driver installation from the third thread linked (My Pc have Win10 on)

I have a question: If driver aren't compatible with mi5 marshmallow how we can make the phone being recognized?

If i can figure out this i ll test every single bands, and report all here :D
[Xiaomi Mi 5 Guides, News, & Discussion] Pistachio20:
did you unlock bootloader and root the phone?
[Xiaomi Mi 5 Guides, News, & Discussion] sys01:
[MENTION=6173338]Pistachio20[/MENTION] not yet

I've sent the request for unlock the bootloader, im waiting a response

But is this procedure possible either for locked and un-rooted phone?
[Xiaomi Mi 5 Guides, News, & Discussion] tndb:
No need to unlock bootloader for this but you might need to root since you cant run

setprop sys.usb.config diag,adb

without su.

If you can get your phone into diag mode by just typing *#*#717717#*#* then you prob dont need root but otherwise you will need it afaik.
[Xiaomi Mi 5 Guides, News, & Discussion] D4V1C0:
any luck unlocking band 4?
[Xiaomi Mi 5 Guides, News, & Discussion] Rupurudu!:
No. Mi5 schematics confirms Band 4, 12, 13 and 20 are not connected. It is not possible to unlock these bands, because they are physically not connected inside the phone.

Link to the schematics file: https: // www .mediafire .com /download/5prv5fvkb64ewe0
[Xiaomi Mi 5 Guides, News, & Discussion] luismatosdias:
Some one knows the steps for enable B20 via hardware?
[Xiaomi Mi 5 Guides, News, & Discussion] D4V1C0:
thanks for the answer. please can you point me exactly where to look?

that schematic is the same for mi5s plus?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Have you got hot air gun with solder?

---------- Post added at 12:12 PM ---------- Previous post was at 12:08 PM ----------

It was explaned some pages ago.
[Xiaomi Mi 5 Guides, News, & Discussion] MYMY999:
""Have you got hot air gun with solder?""

I have.

Please to explain step by step how to connect that
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
I'm working on it. But I must say, software changing is a big problem. Do you see rv item for another bands? There are hundreds items for each band. And band 20 need all this changing.
[Xiaomi Mi 5 Guides, News, & Discussion] D4V1C0:
can't find the mi5s plus schematics. is there any outside?
[Xiaomi Mi 5 Guides, News, & Discussion] MYMY999:
"I'm working on it. But I must say, software changing is a big problem. Do you see rv item for another bands? There are hundreds items for each band. And band 20 need all this changing."

For my just a B20 but other people maybe want oanother bands.
[Xiaomi Mi 5 Guides, News, & Discussion] eaterxd:
One question, I still do not have the phone but I want to buy it, if I unlock the bands and then flash another rom keeps the bands unlocked? If not, can it be unlocked from a custom rom (lineage, aicp, rr, du, aospextend or another)?
[Xiaomi Mi 5 Guides, News, & Discussion] Olegendary:
Hi there! Thanks for trying to unlock bands for noobies) i have this problem with signal loss etc. so i thought maybe unlocking bands would help (was hoping for band 20 but as i see all no luck). But I've heard doing this can cause troubles where you can't even make calls due to wrong steps with qcom and nvrm so the big question is is there a step by step guide how to unlock the bands which can be unlocked at the moment? Thanks
[Xiaomi Mi 5 Guides, News, & Discussion] younes94:
Hello guys !

The schematic is magnificent ! Now we knows !

But what about B28 ? (700mHz)

Thanks !
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Same problem! There are no wire on power amplifier, no duplexer, no filters, no software.
[Xiaomi Mi 5 Guides, News, & Discussion] whydoesntthiswork:
Any luck on at&t anyone?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
So, guys and girls, I have good news and bad news.

Good news.

You need to exchange only one (may be two) chip to make hardware unlock for band 20 possible. You can exchange some part of band 5 to change it to band 20. I choosed band 5 (850Mhz), because it has similar frequency such as band 20 (800Mhz). There are many filters for band 5, which are not very important, and they must also work with band 20 frequency. May be we loose 10-15% of signal power, but this is not critical.

But some parts must be changed.

First of all, look at xiaomi schematic diagram again

Look at page 4. You need FL201 chip (up, right). This is the most important filter for band 5. It is SAW duplexer SAYFH836MBC0F0A

You find this chip on page 1 (schematic diagram)

[IMG="image1"]http://images.vfl.ru/ii/1497187555/6be46c34/17535536.jpg[/IMG]

You must exchange it with SAYFH806MBA0F0A. This is SAW duplexer for band 20. It has same size, ports and other important parameters as band 5 duplexer.

Second changing part is L301 inductor (page 9). This is not very important filter, but i could calculate it. It must be changed with 20 nH (+/- 3%) smd inductor with 0.6x0.3mm size.

[IMG="image2"]http://images.vfl.ru/ii/1497190376/f0cc3f3b/17535973.jpg[/IMG]

There are many another filters, but I could not culculate and they are not very important.

Now bad news

1. Problem

Hardware for band 5 is used not only for LTE. It is used for WCDMA (Umts) and GSM 850MHz to. So, you loose band 5 for LTE, WCDMA and GSM 850 MHz. This can be important in some countries.

2. Problem

Be carefull by soldering! First of all, you need remove all metal cover from RF Modul. I think, you need hot air gun with a small nozzle. The soldering temperature must be max. 250°C and soldering time 5-20 seconds, because SAW components are very sensitive to temperature and can be easy damanged with high temperature.

3. Problem

You need software changing! We use band 5 hardware line, so all ports setting and switchers (antenna switcher, power ampliefier switcher, receiver switcher) must be made for band 5. But treatment of signal in modem, transmitter, power amplifier must be set for band 20. Another Users can help in this problem, because I have not much knowledge in software engineering.

P.S. I think you understand my english.
[Xiaomi Mi 5 Guides, News, & Discussion] sys01:
have you tried to do it on your phone? Because you could do a video tutorial helping newbie users to do it

Thanks a lot btw, great news for sure!
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
I have not xiaomi. I have qiku ultimate 808. But i have same problem with band 20.
[Xiaomi Mi 5 Guides, News, & Discussion] D4V1C0:
any workaround for band 4?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
Do you need (use) band 3?
[Xiaomi Mi 5 Guides, News, & Discussion] User Without a Name:
Such a shame Xiaomi does not provide B20 in their MI5 models.

I would love to buy this phone for it's specs and features but not having B20 is a major bummer.
[Xiaomi Mi 5 Guides, News, & Discussion] chiin0e:
You got a solution for band 4?

PD. Not using band 3 at my country
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
I have a same solution such as for band 20. You can exchange some hardware parts of band 3 to change it to band 4. This works, because band 3 and 4 have a similar frequency. But there are same problems such as for band 20.
[Xiaomi Mi 5 Guides, News, & Discussion] altmis6:
Hey RBSonic

Is this method can be for Mi 5s Plus ?

(Band 5 changing to Band 20 method)
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
If schematic of mi5s is same mi5, it can work. BUT don't forget about software changing. I'm not sure, nvram changing can be not enough. May be you need change something in modem software (NON-HLOS.bin).
[Xiaomi Mi 5 Guides, News, & Discussion] rible:
Actually, Xiaomi Mi5s has the same setup with Mi Note 2 that has a global version (band 20 included).

Any chance we can get Global Mi Note 2 schematics ?
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
So I can see, all these phones mi5, mi5c, mi5s, mi5s Plus and Note 2 have a same Power Amplifier, skyworks sky77646.

BUT, mi5 has not Duplexer for Band 20 and Note 2 has it.

What about another models, i don't known. My assumption is, that mi5c, mi5s and mi5s plus have not duplexer for band 20 to.

P.S. Has somebody (or your friends) Axon 7 (mini) A2017G. I need QCN File to find some nvram items.
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
I found a list with software, which can be helpfull to us.

http://www.finetopix.com/showthread.php/47223-Latest-(11-16)-QXDM-QPST-QDART-QUD-patched
[Xiaomi Mi 5 Guides, News, & Discussion] DreckSoft:
For the MI5s please check this thread: https://xdaforums.com/mi-5s/help/trying-to-unlock-lte-umts-bands-t3622874/

If someone has the schematics or did more tests, please share.
[Xiaomi Mi 5 Guides, News, & Discussion] gingerboy92:
Hello, i've read most of the pages in this thread(from page 30 upwards). Still a bit confused with carrier aggregation. Can we actually enable it? Almost all the discussion was about unlock bands, but i'm just wondering if it's possible to unlock interband carrier aggregation. Most of the carriers in my country uses b3+b7 lte. While one carrier uses b5 + b40(already unlocked band 5). Is it possible to use any of the combination? I'm asking because the first thing that came out when i googled mi 5 carrier aggregation is a miui forum thread abou 3CA with a MIUI Device Team tag, but yet i still fail to get even 2CA to work(not sure if it's because no carrier in my country uses it lol). Thank you very much
[Xiaomi Mi 5 Guides, News, & Discussion] greasymonkey1960:
I have used my Mi5 with 2CA, active bands were B1 & B5 and other occasions B1 & B3, this was in Smart Philippines network.

In terms of changing CA pairings, it is fixed in hardware, at this time. There is a gradual move toward "software-defined" CA, but in the current hardware, it is limited.
[Xiaomi Mi 5 Guides, News, & Discussion] gingerboy92:
Ah. Yes. A few pages back there's a post saying that it only supports a few B1 pairs. So looks like no CA for me then, should have went with a samsung A series instead lol. That's sad. Thank you very much for the answer.
[Xiaomi Mi 5 Guides, News, & Discussion] tehmal:
Anyone tries in Redmi 3/Prime?

maybe..... 900mhz lte? :>
[Xiaomi Mi 5 Guides, News, & Discussion] TEEEEEEEEED:
Hey guy, I am planning to visit Norway and I may go to Preikestolen, Kjerag, Trolltunga and Knivskjellodden. Could you just tell me if band 20 is used at these places?

By the way, what is the easiest way to get to Knivskjellodden from Tromsø :p
[Xiaomi Mi 5 Guides, News, & Discussion] NGM89:
Following this post. Intresting.
[Xiaomi Mi 5 Guides, News, & Discussion] andrei80:
Thanks for trying and for sharing
[Xiaomi Mi 5 Guides, News, & Discussion] sunilromy:
Hey.. just an input to help. I did a good research long ago in band unlocking on qualcomm phones. just in short... enabling band via nv, will only work if the phone have that band network parameters. some phone works that way, because that band network parameters are pre-feeded in the phone, so just by enabling it via NV, it works.

if you want certain band to work, ie. band 20, try to grab qcn file of other mi device which have band 20 enabled by default, pull out the parameters of band 20, add it in to your qcn file, flash it and viola..

it sounds good when i say it, but success is uncertain. its quite fun to research though.

for your reference, i am attaching a patched xml file, so you are aware of what parameter to extract also a qcn file..
[Xiaomi Mi 5 Guides, News, & Discussion] RBSonic:
There are problems with hardware. You need special band filter, to use band 20. We have schematic of mi5 and it has not hardware for band 20.