yashsingh1/xdaforums huggingface dataset:
[Redmi Note 2 General] felix168:
sent you a message since I don't want to go off topic too much.
[Redmi Note 2 General] Poppeye0:
Check on kimovil. Com
[Redmi Note 2 General] existen:
Hello guys , I have not followed much the discussion , so I wanted to know if there is any news about unlocking 800 MHz bands on redmi Notes 2, Thank you
[Redmi Note 2 General] SkiFire13:
Nothing for now

~ Xiaomi Redmi Note 2 Prime ~
[Redmi Note 2 General] MikeFRG:
What is about this boxes ? http://www.gsmdude.com/threads/infi...iatek-v1-22-mt6795-android-5-x-and-more.2131/ / http://cs-tool.com/features/
[Redmi Note 2 General] james3Italy:
Does anyone knows how this seller was able to Unlock LTE on a TDD China Redmi note 2 ?

I found over Aliexpress a seller that claims it was able to enable FDD frequencies on a TDD installing a custom firmware I can't paste links here because I'm new in the forum try to look here

i.imgur.com/HoNdI38.jpg
[Redmi Note 2 General] existen:
can you send me a pm with the link of the seller?

Ty
[Redmi Note 2 General] jack_21:
It seems that there is a TDD firmware that locks 1,3,7 bands.

Installing a FDD firmware will unlock bands. Consider that there are not hardware differences, as the TDD version of the phone is the same as FDD
[Redmi Note 2 General] james3Italy:
Yeah I think so but I'm looking for more details before buying a TDD version that I'm not sure I'll be able to use.

Another thing I didn't understood is if the LTE can work on both SIM or just on the 1st one

anyone if someone that has more details could give us information, i'd be pleased
[Redmi Note 2 General] jack_21:
You can use LTE on both sim slot (but only one at time)

Puoi usare l'LTE in entrambi gli slot (ma solo una sim per volta.)

Se ad esempio hai:

- Slot 1 H3G e Slot 2 Vodafone

Puoi scegliere quale sim deve avere il 4G/3G. Se scegli la seconda la prima andrà solo in 2G, e nel caso di H3G la SIM andrà in roaming con TIM

-Slot 1 Vodafone e Slot 2 TIM

Se scegli la Tim per la connessione dati la scheda Vodafone andrà in 2G e la Tim in 3G o 4G.
[Redmi Note 2 General] james3Italy:
Yes I got that but I'd like to find reliable info about converting TDD Redmi Note 2 into FDD TDD, about what I read it seems that you just need to install the international rom
[Redmi Note 2 General] andrea2107:
it would be really interesting if someone could unlock LTE :D
[Redmi Note 2 General] SkiFire13:
We already have lte... We need more bands because we have only 1 3 and 7

~ Xiaomi Redmi Note 2 Prime ~
[Redmi Note 2 General] androik:
+1
[Redmi Note 2 General] zombiegoaste:
If I understand correctly, the bands that are "useable" are determined during baseband firmware compile

Engineering Mode / Maui Meta can only change NVRAM setting can only switch the "useable" ones on or off.

The good news are that I have on good authority that Xiaomi Redmi Note 2 (which has same Helio SoC and thus same baseband) had sources leaked, including baseband sources.

The bad news is that one still needs some serious dev chops to compile an "all bands usaeable" baseband firmware .
[Redmi Note 2 General] mrsurge:
We tried using another baseband entirely, from a phone that has the bands in question enabled. the same NV values that were available with the stock firmware were still the only ones available with the other. That tells me that the ability to enable the bands in question are not dependant, at most, on the modem firmware alone. Modifying the NV Ram, alone, has been a solution to unlocking bands on other phones, so naturally one would assume that this would be the case for this one
[Redmi Note 2 General] zombiegoaste:
If I recall correctly (I've looked through some stuff from leaked Redmi baseband sources) you determine "available" bands in the firmware code before compiling
[Redmi Note 2 General] mrsurge:
Link me to it, I know c. Tell me where it says that and if its true I may be able to do something.
[Redmi Note 2 General] SkiFire13:
Maybe we need to use another baseband and modify the nvram values?

~ Xiaomi Redmi Note 2 Prime ~
[Redmi Note 2 General] Crim Soukyuu:
That won't do you any good, though, you'd have to know which values to define, and it's not as simple as telling it to use x MHz. I linked to that part of the code on the first few pages of this thread, but that repo was taken offline.
[Redmi Note 2 General] mrsurge:
Look the guy was telling me he had something, in the source documentation, that said it works through the firmware, I said no it probably through the NVram values, but he insisted. Furthermore, you don't tell me what I can and can't do, or what's not that easy... If I say its a rocketship and not a phone then its a damn rocketship. You keep your damn condescending opinions to your damn self.

---------- Post added at 06:39 PM ---------- Previous post was at 06:37 PM ----------

Perhaps but the baseband would be the very easiest part
[Redmi Note 2 General] chris5932:
You can get NVRAM Values from the chipsets (If I recall correctly MT6595) that I described somewhere back. However there are neither helpful sources around nor I found a way to edit nvram. I think the LCSH MT6795 Baseband from may is pretty useless.
[Redmi Note 2 General] zombiegoaste:
Check PM (sent two links, Helio sources w/ baseband (first link) and a collection of MTK baseband sources (second link))
[Redmi Note 2 General] Crim Soukyuu:
Your life is too short spending it looking for imagined insults around every corner. I merely told you the sources that got leaked so far won't really help you implement the missing bands, because they're not commented out, they're completely deleted, including the corresponding code that actually makes them work. About the only way you could re-implement them is if you worked for Mediatek and knew which values to set. But hey, what do I know.
[Redmi Note 2 General] mrsurge:
Like I said before the answer is not in the modem firmware. I've replaced the note 2 modem firmware with other phones that support said bands and the available NV Ram options did not change. The more I think about it the more it becomes apparent that the problem is definitely NVram related, even if the hardware antenna is even compatible with those frequencies which I'm starting to doubt that as well
[Redmi Note 2 General] Danacy:
Good to see people still working and discussing this subject! I can't really help I guess so I'll just leave a compliment to you guys every now and then, ok? ;)
[Redmi Note 2 General] _Kurosu_:
New phone claiming to support bands 1/3/7/20 (click "parameters") (and only B40 in TDD-LTE??)
[Redmi Note 2 General] mrsurge:
That's great, but guess what? I know from personal experience, Elephone is truly garbage. And I mean that in the most sincere way. Trust me, Xiaomi is one of the few Chinese vendors you can trust.
[Redmi Note 2 General] _Kurosu_:
I don't dispute that, hence the "claim". I was merely saying: it might be interesting to verify that claim (the phone should be reviewed next week iiuc). And if it is verified, extracting info & baseband may be useful.
[Redmi Note 2 General] chemicalboyxda:
Maybe the redmi note 3 pro with qualcomm will be easier to unlock lte bands.

Enviado desde mi XT1254 mediante Tapatalk
[Redmi Note 2 General] SkiFire13:
Yes, but it isn't applycable to our device.

~ Xiaomi Redmi Note 2 Prime ~
[Redmi Note 2 General] gaseoso:
I have a LETV X500, updating've lost a band, we have recovered without losing IMEI, it is etc / firmware / módem_1_ltg_img and módem_lwg_n_img. It would be possible for any owner of a vowney elephone same processor or another the rise ??
[Redmi Note 2 General] TziMmysGr:
I thing that we have already tried flashing the modems with no luck, but coming this from you is a hope.
[Redmi Note 2 General] HS Chang:
I think it might be helpful determine your consideration about LTE band unlock..

It is for RF IC of MTK. I've saw Redmi Note 2 & 3 tear down review and find this document.

*for the LTE usually it can use 3 bands(B1/B3/B7) for FDD and 4 bands(B38/ B38/ B40/B41) for TDD.

1. Note2 tear down

en.miui.com/thread-146325-1-1.html

2. What can I say.. RF front-end? MTK6169V.. check 7 page..

doc.xuehai.net/s5ebe398c05b1028a6325cd9c.html

I am not sure but it might be very similar concept I believe.
[Redmi Note 2 General] mps123p:
I think that the Rf chip is this http://www.skyworksinc.com/Product/3065/SKY77643-11 (Redmi-Note-2-16.jpg) and this chip support the lte class band 4.

The elephone P8000 Networks B support lte band 4 maybe this is the baseband to try
[Redmi Note 2 General] camvar97:
It would be nice to get band 4 since Bell in Canada uses that for LTE over there older 2600 LTE bands. If someone tries the baseband and it works let me know. I used to do some mobile dev work (xperia ssfalcon) but I won't try the baseband, not my area.

--edit--

Link: http://m.genk.vn/dien-thoai/mo-bung...-re-ma-chang-he-cat-giam-2015090518093158.chn

This shows that our rf chip is a skywork 77643-11, which supports band 4.

--edit 2--

Link:http://m.pc841.com/pingce/20150818-52797_3.html

But this is saying we have a skywork 77916-11 and a skywork 77643-11
[Redmi Note 2 General] MikeFRG:
Teardown: http://www.gizchina.com/2015/08/18/xiaomi-redmi-note-2-teardown/

Chip : http://www.skyworksinc.com/Product/3065/SKY77643-11
[Redmi Note 2 General] HS Chang:
maybe I was wrong. for RF.

Basically I thought MTK6169 can select GSM/WCDMA/LTE bands and Skyworks may amplify signal.

Anyway I will read more carefully about skyworks data sheet.

Regards,
[Redmi Note 2 General] fresh_leaf:
I noticed on the specs page for the Note 3 on mi.com that the "Full Netcom" version of the Note 3 supports LTE bands 1/2/3/4/5/7/8/38/39/40/41. Does this lend any hope toward unlocking bands for the Note 2?

Edit: Though I'm thinking this may actually be a typo.

Edit: Also, I believe the "Full Netcom" version is actually the Note 3 Pro with the SD650.
[Redmi Note 2 General] chemicalboyxda:
I have the note 3 pro and in my country have full lte support. My country is band 4. In usa will work too
[Redmi Note 2 General] katarsis22:
is there anything new about this issue? i need to unlock band20 for my country but i can not find anything usefull about this. There are sources in the github for helios and baseband of rm 2.
[Redmi Note 2 General] modaniel:
any further progress in this?
[Redmi Note 2 General] Hogenhogen:
Someone tryed these items for unlocking umts/lte bands of mediatek?

Is it useless?

tp://mediatek.software.informer.com/pages/4/
[Redmi Note 2 General] jkd:
Is there any solution to unlock band20 ?
[Redmi Note 2 General] harizamzi:
so reno 2 now abandon devices..let move on
[Redmi Note 2 General] jdd1:
Mtk banda lte

nothing yet unlocking bands for mtk.
[Redmi Note 2 General] mortmaru:
I guess every one gave up on this which is a shame it would of been nice if the extra bands could of been unlocked
[Redmi Note 2 General] omlet:
I think that MX5 hasen't got 800Mhz...
[Redmi Note 2 General] Xmister:
I was looking at this page, and it states B20. Of course, this can be a mistake too.
[Redmi Note 2 General] andy775:
Will do,

I'll peep it when I get home from work... In the meantime, if people are really serious about paying for this type of functionality to be added, you could donate to Xmister for at least taking a look at our options...

I'll get back to you guys in a few hours!
[Redmi Note 2 General] omlet:
Modem fail here :(

Can't enter pin, no network in settings
[Redmi Note 2 General] Klanac89:
http://www.efox-shop.com/elephone-v...smartp-g-303798?source=webgains&siteid=170479

http://m.geekbuying.com/ItemDescription/343086

http://m.geekbuying.com/ItemDescription/345521

http://www.efox-shop.com/bluboo-x50...dschirm-android-50-4g-lte-smartphone-g-301760

So, this phones got MTK6795 Helio X10 and band 20 (800MHz).

Elephone put a lot of files on elephone forum.
[Redmi Note 2 General] andy775:
edit:

Pushed both modem.img files and rebooted, Checked bandmode in MTK Engineering mode, Band 20 under LTE is disabled. LTE support bands are 1, 3, 7, 38, 39, 40, 41.

edit:

Pushed the whole firmware folder, no changes.
[Redmi Note 2 General] Xmister:
Maybe the MX5 doesn't have B20 after all...I'm not sure as some sites state it some don't.

All the phones that Klanac89 linked are new or unreleased, and I couldn't find any ROM for them.

If anyone know a MTK6795 phone that surely has B20 and there is an available ROM for it please let me know.

In the meantime I'm uploading the firmware of Jiayu S3 for testing. it's a different SOC, but it looks like it has the same modem inside, and supports B20, so it's worth a try.

If it won't help, you can try renaming the files in the mddb folder to the same names as in Note2, and overwrite them on your phone. Just don't forget to backup, and the permissions.

Edit:

HTC One M9+ has the same SOC and supports B20. Attached the M9+ Firmware and MDDB files too.

Happy testing. :)
[Redmi Note 2 General] ferlie:
No Band 5?? Sadly
[Redmi Note 2 General] Klanac89:
MX5 dosen't support band 20.

When I go /system/etc/firmware/

I find Modem 6630 (on any MTK device 2014/2015).
[Redmi Note 2 General] andy775:
Files downloaded... Bringing my tablet to work today to flash these to see if there are any changes. The m9 was the first phone that came to mind when researching the soc. Hopefully we get some results!
[Redmi Note 2 General] lampisd:
try anybody?work?
[Redmi Note 2 General] andy775:
Wouldn't you know that I left my tablet right next to my front door this morning... (Or so I think...)

I'll be home in a few hours to test em out.
[Redmi Note 2 General] Klanac89:
Go Andy, go Andy :D
[Redmi Note 2 General] andy775:
M9 Firmware Installed : No change in LTE Bands, same 7 bands still available.

M9 MDDB Installed (After testing with M9 Firmware) : Same results from engineering mode, the same 7 bands are still available. (1,3,7, 38, 39, 40, 41)

I copied the S3 MDDB and firmware files at the same time. Phone isn't able to locate my sim card, and only has GSM showing in band mode, with a query failed response. All LTE Information screens have 0 for any variables that might be assigned. Doesn't look like it is compatible.

Back to my fresh restore point, same available 7 LTE bands.
[Redmi Note 2 General] Xmister:
That means the baseband definitions probably missing for B20 just like in the leaked source. But without proper documentation it might be impossible to find the correct values needed for the definition.
[Redmi Note 2 General] andy775:
At least we explored this avenue....
[Redmi Note 2 General] omlet:
Yep!
[Redmi Note 2 General] Xmister:
There is a wild possibility of flashing the M9+ baseband on the Note2 might do the trick... But it would be pretty risky to do so. The possibilities range from lost imei to a bricked phone.
[Redmi Note 2 General] andy775:
There be dragons eh?

Think it has high probability of making it so we can't recover from fastboot? I wouldn't be against maybe giving it a shot this weekend.
[Redmi Note 2 General] majamee:
Maybe some information about how the LTE bands are stored for Qualcomm devices. Perhaps this might help to find some similarities how it is done in Mediathek's sources: http://xdaforums.com/showpost.php?p=55635592&postcount=3
[Redmi Note 2 General] andy775:
Good info, Thanks!
[Redmi Note 2 General] Klanac89:
M9+ don't got band 20?!?!

Gesendet von meinem Redmi Note 2 mit Tapatalk
[Redmi Note 2 General] andy775:
I'm more interested in enabling 2, 3, 4, 5, 7, 12, 17, and 29 for my region, but at this point, I think we are looking for some results that have different bands than the ones enabled by default.

Looks like m9+ has 1, 3, 5, 7, 8, 28, 38, 39, 41. If flashing the baseband would allow us to enable said bands in engineering mode, then I think we are on the right track, minus getting the bands that we are waiting for...
[Redmi Note 2 General] Klanac89:
Will this work on Mi4c?

Gesendet von meinem Redmi Note 2 mit Tapatalk
[Redmi Note 2 General] majamee:
Send me one and I am happy to try. ;) the information is supposed to be generally true for Qualcomm chips. Nevertheless the mi 4c is so new, that I doubt that anyone has tried this yet. Thing is, only software disabled bands can be enabled that way, if it is dive somewhere on hardware level you probably have no chance.
[Redmi Note 2 General] andy775:
And that uses Qualcomm tools to edit data doesn't it?

Haven't found said tools for mediatek socs...
[Redmi Note 2 General] Xmister:
I still havn't got my phone, so if we would like to try this, I will need some info about the partition layout.

Can post the output of these:

cat /proc/emmc

cat /proc/mtd

cat /proc/partitions

Some of them might not work.

I was looking at the nvram hack of Qualcomm devices. MediaTek can use similar technology, but until we have some tools to modify these values, we can't do much about it.
[Redmi Note 2 General] Okluzhion:
[MENTION=2718533]Xmister[/MENTION]

u0_a88@hermes:/ $ cat /proc/emmc
partno: start_sect nr_sects partition_name
emmc_p1: 00000400 00001800 "proinfo"
emmc_p2: 00001c00 00002800 "nvram"
emmc_p3: 00004400 00005000 "protect1"
emmc_p4: 00009400 00005000 "protect2"
emmc_p5: 0000e400 00000200 "seccfg"
emmc_p6: 0000e600 00002000 "lk"
emmc_p7: 00010600 00008000 "boot"
emmc_p8: 00018600 00040000 "recovery"
emmc_p9: 00058600 00003000 "secro"
emmc_p10: 0005b600 00000400 "para"
emmc_p11: 0005ba00 00004000 "logo"
emmc_p12: 0005fa00 00005000 "expdb"
emmc_p13: 00064a00 00002800 "tee1"
emmc_p14: 00067200 00004e00 "tee2"
emmc_p15: 0006c000 00400000 "system"
emmc_p16: 0046c000 0012c000 "cache"
emmc_p17: 00598000 017b9c00 "userdata"
emmc_p18: 01d51c00 00008000 "flashinfo"
u0_a88@hermes:/ $ cat /proc/mtd
/system/bin/sh: cat: /proc/mtd: No such file or directory
1|u0_a88@hermes:/ $ cat /proc/partitions
major minor #blocks name

254 0 262144 zram0
254 1 262144 zram1
254 2 262144 zram2
254 3 262144 zram3
7 0 1254 loop0
179 0 15388672 mmcblk0
179 1 3072 mmcblk0p1
179 2 5120 mmcblk0p2
179 3 10240 mmcblk0p3
179 4 10240 mmcblk0p4
179 5 256 mmcblk0p5
179 6 4096 mmcblk0p6
179 7 16384 mmcblk0p7
179 8 131072 mmcblk0p8
179 9 6144 mmcblk0p9
179 10 512 mmcblk0p10
179 11 8192 mmcblk0p11
179 12 10240 mmcblk0p12
179 13 5120 mmcblk0p13
179 14 9984 mmcblk0p14
179 15 2097152 mmcblk0p15
179 16 614400 mmcblk0p16
179 17 12439040 mmcblk0p17
179 18 16384 mmcblk0p18
179 96 4096 mmcblk0rpmb
179 64 4096 mmcblk0boot1
179 32 4096 mmcblk0boot0
179 128 31166976 mmcblk1
179 129 31162880 mmcblk1p1

Sent from my Redmi Note 2
[Redmi Note 2 General] andy775:
At a business meeting today... Will post when I have some time if you need additional results!

partno: start_sect nr_sects partition_name

emmc_p1: 00000400 00001800 "proinfo"

emmc_p2: 00001c00 00002800 "nvram"

emmc_p3: 00004400 00005000 "protect1"

emmc_p4: 00009400 00005000 "protect2"

emmc_p5: 0000e400 00000200 "seccfg"

emmc_p6: 0000e600 00002000 "lk"

emmc_p7: 00010600 00008000 "boot"

emmc_p8: 00018600 00040000 "recovery"

emmc_p9: 00058600 00003000 "secro"

emmc_p10: 0005b600 00000400 "para"

emmc_p11: 0005ba00 00004000 "logo"

emmc_p12: 0005fa00 00005000 "expdb"

emmc_p13: 00064a00 00002800 "tee1"

emmc_p14: 00067200 00004e00 "tee2"

emmc_p15: 0006c000 00400000 "system"

emmc_p16: 0046c000 0012c000 "cache"

emmc_p17: 00598000 0349dc00 "userdata"

emmc_p18: 03a35c00 00008000 "flashinfo"

major minor #blocks name

254 0 262144 zram0

254 1 262144 zram1

254 2 262144 zram2

254 3 262144 zram3

7 0 1254 loop0

179 0 30535680 mmcblk0

179 1 3072 mmcblk0p1

179 2 5120 mmcblk0p2

179 3 10240 mmcblk0p3

179 4 10240 mmcblk0p4

179 5 256 mmcblk0p5

179 6 4096 mmcblk0p6

179 7 16384 mmcblk0p7

179 8 131072 mmcblk0p8

179 9 6144 mmcblk0p9

179 10 512 mmcblk0p10

179 11 8192 mmcblk0p11

179 12 10240 mmcblk0p12

179 13 5120 mmcblk0p13

179 14 9984 mmcblk0p14

179 15 2097152 mmcblk0p15

179 16 614400 mmcblk0p16

179 17 27586048 mmcblk0p17

179 18 16384 mmcblk0p18

179 96 4096 mmcblk0rpmb

179 64 4096 mmcblk0boot1

179 32 4096 mmcblk0boot0

Nothing for mtd
[Redmi Note 2 General] SkiFire13:
Maybe this can help

Spoiler content hidden.
[Redmi Note 2 General] Klanac89:
Elephone start shipping Helio X10 device with band 20, but no firmware found

Gesendet von meinem Redmi Note 2 mit Tapatalk
[Redmi Note 2 General] andy775:
Something we've been examining for sure.
[Redmi Note 2 General] MikeFRG:
??? http://xdaforums.com/showpost.php?p=63035973&postcount=23
[Redmi Note 2 General] andy775:
Interesting.. My 32 gig version has some diff availabilities for LTE bands.
[Redmi Note 2 General] Xmister:
It's known that the TD version can be hacked to FDD, those LTE bands are in the baseband, they just need to change the firmware files.

On another note:

My phone will be here tomorrow if everything goes right, we'll see what can I do with it.

About using the M9+ baseband...I will need an M9+ baseband image, but looking at the partition layout, I'm not sure where is it stored yet. Some forum says it's inside the nvram partition, but that seems weird, as it should have some device specific info (like imei, etc.)

The best would be to have a copy of every partition of an M9+(except of course system, data, boot and recovery) , then we can compare and experiment, and possibly get somewhere closer to our goal.
[Redmi Note 2 General] lampisd:
any news about the unlock?
[Redmi Note 2 General] omlet:
Nothing
[Redmi Note 2 General] P1n3apqlExpr3ss:
How does the unlocking work with the TDD-LTE model? Do the retailers flash some firmware? If so, is it persistent if you were to flash the xiaomi.eu builds? Or does it just work regardless?
[Redmi Note 2 General] Xmister:
My guess would be that it's persistent, because the firmware files are in the ROM you install.
[Redmi Note 2 General] freestart:
Apparently the hacked phones were shipped with 150917_Redmi_NOTE2_V6.7.3.0.LHMCNCH_FDD.rar

oppomart provided me this link where to download it:

pan.baidu.com/s/1ntH30k5
[Redmi Note 2 General] Xmister:
Can you upload it to somewhere else...with less chinese? :)
[Redmi Note 2 General] jack_21:
Someone that has an only TDD phone may try if that firmware can change something

But i don't think
[Redmi Note 2 General] Klanac89:
If you can make TDD to FDD it need to be possible to unlock more.

Gesendet von meinem Redmi Note 2 mit Tapatalk
[Redmi Note 2 General] susch19:
I have downloaded it from baidu and uploaded it to mega and the download took longer than the upload :D

150917_Redmi_NOTE2_V6.7.3.0.LHMCNCH_FDD.rar
[Redmi Note 2 General] MikeFRG:
Thanks DL took 1:50 min :good:
[Redmi Note 2 General] susch19:
For me it took 1h 30min for download and 20min for upload. Full speed download would have taken 6min
[Redmi Note 2 General] freestart:
I lost a lot of time for downloading from baiudu for upload it on other server but you was more fast :silly: :)

PS. I hope that someone can study the file for unlock all bands
[Redmi Note 2 General] kornelio6:
Hi guys, not an expert, but it looks like I may have received one of those Redmi2 with unlocked bands. (not 100% sure). I flashed xiaomi EU dev because reseller rom sucked hard (gearbest)

Would be glad to help (but please don't expect me flashing experimental stuff, it's my main phone these days).
[Redmi Note 2 General] majamee:
You can check the enabled LTE bands with this tool:

https://play.google.com/store/apps/details?id=com.themonsterit.EngineerStarter

start it > MTK Settings > Band Mode > Select your Sim --> Your enabled bands will be shown.
[Redmi Note 2 General] kornelio6:
Thanks. Enabled bands are 1, 3, 7, 38, 39, 40 and 41.
[Redmi Note 2 General] spydo97:
On the Chinese MIUI forum, it confirms that TDD version rom could flash to FDD rom, and so does FDD version.

Therefore, many people bought the cheaper version(TDD) and flash it to FDD rom.

And in the earlier TDD rom. In Options, there is a button to switch the network limit(TDD to FDD).

In the latest TDD rom, MIUI just drops this button.

By the way, One of these threads describes that TDD can use FDD bandmode without flashing FDD rom.

If you're using TDD rom, just delete the file "data\miui\ot" and reboot the phone, then it can use the FDD bandmode.