Well that just seems silly. When I'm connected to 3G/H+, I'm still connected to the same carriers network. Roaming is a whole different animal.
Unlocking LTE Bands
- Thread starter ssuds
- Start date
I stumbled upon this japanese blog and it seems like the writer used DFS CDMA Tool to unlock 800mhz?
blogs.yahoo.co.jp/ashiyura_kei/33324643.htm
I couldnt find what rf power amplifier the mi4c's using, but other snapdragon 808 phones seem to be able to connect to a lot more bands.
I have never used QPST/QXDM and I'm too afraid to. Is anyone still here that's willing to risk their phone?
blogs.yahoo.co.jp/ashiyura_kei/33324643.htm
I couldnt find what rf power amplifier the mi4c's using, but other snapdragon 808 phones seem to be able to connect to a lot more bands.
I have never used QPST/QXDM and I'm too afraid to. Is anyone still here that's willing to risk their phone?
is there any way to read that japanese blog in english?I stumbled upon this japanese blog and it seems like the writer used DFS CDMA Tool to unlock 800mhz?
blogs.yahoo.co.jp/ashiyura_kei/33324643.htm
I couldnt find what rf power amplifier the mi4c's using, but other snapdragon 808 phones seem to be able to connect to a lot more bands.
I have never used QPST/QXDM and I'm too afraid to. Is anyone still here that's willing to risk their phone?
View it in Chrome and select translate.
I doubt you can unlock any bags using mere software and rooting. You need to reverse engineering the crap out of the phone in order to do so.
I anyone managed to to this successfully, it'd be all over the internet by now, which is isn't.
IMHO this thread should be closed.
I anyone managed to to this successfully, it'd be all over the internet by now, which is isn't.
IMHO this thread should be closed.
it was possible to unlock band 20 on Redmi Note 3 with SD650 so i don't see why it would not be possible with SD808 in Mi4c, just because you lack knowledge doesn'tt mean something is impossible
this thread, open, is a hope for those, like me, that bought the mi4c thinking that any day someone will discover the way to unlock more lte bands.
in my country we need bands 4 and 28 that the mi4c hasn't enabled, then i'm using the phone 3g only + wifi
It is possible using the tutorial linked here http://forum.xda-developers.com/crossdevice-dev/sony/thread-progress-please-leave-im-updating-t2871269
The drivers needed to accomplish this is the QDLoader drivers.
This was tested using Team Superluminal's CM13.1, somewhen during the July-September 2016
Before doing this, make a nandroid using Team Superluminal's TWRP as only their recovery backup critical partitions that can save your device if you broke the reception using the tool.
I won't give the complete tutorial, however I will point the steps that need to be modified:
Skip step 3.5
There will be only one COM port. Use that instead
The RF_BC_CONFIG NVRAM values you need will be pasted below, don't check everything as this will broke reception
The drivers needed to accomplish this is the QDLoader drivers.
This was tested using Team Superluminal's CM13.1, somewhen during the July-September 2016
Before doing this, make a nandroid using Team Superluminal's TWRP as only their recovery backup critical partitions that can save your device if you broke the reception using the tool.
I won't give the complete tutorial, however I will point the steps that need to be modified:
Skip step 3.5
There will be only one COM port. Use that instead
The RF_BC_CONFIG NVRAM values you need will be pasted below, don't check everything as this will broke reception
I can't really confirm if the enabled values did enable the locked bands. However this procedure doesn't broke my reception so why not ¯\_(ツ)_/¯
The most important Band is still missing. Band 20 is where pretty much everything is sending...so, this is pretty useless.
Didn't work on Mi-4c. I enabled all US GSM LTE bands, 2, 4, 5, 12, 17. Rebooted and read back lte_bc_config value to make sure it stuck, and it did.
However, no change. Nothing good happened, but nothing bad happened either so I guess I won't bother changing it back.
I guess there must be a hardware limitation.
However, no change. Nothing good happened, but nothing bad happened either so I guess I won't bother changing it back.
I guess there must be a hardware limitation.
Last edited:
Hi guys,
This is my first post, i'm new to XDA and a noob in Android. I work as software developer in argentina, so i understand concepts like hardware, processor, firmware, OS and so on, but i have no experience of any kind in android developing or modding, i have never flashed a rom. I'm here to learn and contribute if i can.
I have bought a Xiaomi mi 4c for my daughter, and from then started reading a lot about custom roms and android OS. Mi4c came with lte bands 1,3,7 enabled and nothing more, and in my country lte bands 4 and 28 are used. i knew this before i bought the phone and its not a problem cause we are almost always connected to wifi. I think mi4c is a great phone, fast processor and full of features.
At this moment i have read a lot about unlocking LTE bands, specially about modifying NV values (6828, 6829, etc) and found that almost nobody could succesfuly unlock bands. as far as i can understand, its not enough to enable a particular band by modifying NV values, the modem firmware needs to know how to handle that band prior to use it. That kind of information its not located in the andoird rom itself, and thats why installing different custom or stock roms doesn't effectively enable extra bands. That information is located in the modem firmware (modem.bin, non-hlos.bin) and that code its not open source, its held protected by qualcomm.
So i have found another phone with the same SoC as mi4c that comes with more lte bands enabled from stock. im talking about Nextbit Robin phone, wich has this bands enab led from stock condition:
GSM 850/900/1800/1900
HSPA 850/900/1700/1800/1900/2100
LTE Bands 1/2/3/4/5/7/8/12/17/19/20/28
I wonder if could be possible to enable the same bands in mi4c just by flashing the robin modem files into mi4cs. is there any chance of success? does anybody tried to?
i know it was a very long post, sorry for that, i just wanted to introduce my self. i ll write shortly next time
This is my first post, i'm new to XDA and a noob in Android. I work as software developer in argentina, so i understand concepts like hardware, processor, firmware, OS and so on, but i have no experience of any kind in android developing or modding, i have never flashed a rom. I'm here to learn and contribute if i can.
I have bought a Xiaomi mi 4c for my daughter, and from then started reading a lot about custom roms and android OS. Mi4c came with lte bands 1,3,7 enabled and nothing more, and in my country lte bands 4 and 28 are used. i knew this before i bought the phone and its not a problem cause we are almost always connected to wifi. I think mi4c is a great phone, fast processor and full of features.
At this moment i have read a lot about unlocking LTE bands, specially about modifying NV values (6828, 6829, etc) and found that almost nobody could succesfuly unlock bands. as far as i can understand, its not enough to enable a particular band by modifying NV values, the modem firmware needs to know how to handle that band prior to use it. That kind of information its not located in the andoird rom itself, and thats why installing different custom or stock roms doesn't effectively enable extra bands. That information is located in the modem firmware (modem.bin, non-hlos.bin) and that code its not open source, its held protected by qualcomm.
So i have found another phone with the same SoC as mi4c that comes with more lte bands enabled from stock. im talking about Nextbit Robin phone, wich has this bands enab led from stock condition:
GSM 850/900/1800/1900
HSPA 850/900/1700/1800/1900/2100
LTE Bands 1/2/3/4/5/7/8/12/17/19/20/28
I wonder if could be possible to enable the same bands in mi4c just by flashing the robin modem files into mi4cs. is there any chance of success? does anybody tried to?
i know it was a very long post, sorry for that, i just wanted to introduce my self. i ll write shortly next time
Welcome to the forum
Short answer -- you can't enable any more LTE bands. Some people claim they enabled software support in the modem driver, but the problem is hardware; Xiaomi disabled all unsupported LTE bands on the antenna and they do this on almost all of their models. Sorry
So, by hard modding the antenna (which require hardware skill), is it possible to unlock more LTE bands? This phone have very good price/performace, so if there any trick, mod, rom to improve it, than why not?Welcome to the forum
Short answer -- you can't enable any more LTE bands. Some people claim they enabled software support in the modem driver, but the problem is hardware; Xiaomi disabled all unsupported LTE bands on the antenna and they do this on almost all of their models. Sorry
I guess it should be technically possible, but good luck finding someone who knows how to do thisSo, by hard modding the antenna (which require hardware skill), is it possible to unlock more LTE bands? This phone have very good price/performace, so if there any trick, mod, rom to improve it, than why not?
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