yashsingh1/xdaforums huggingface dataset:
[Hardware Hacking General] darkhorse1870:
You are brave, thank you! :good:
[Hardware Hacking General] damn66:
managed to input up to 15 Custom CHs, thereafter the app force close after trying to input no. 16..still some work to be done ;)
[Hardware Hacking General] CrisMijia:
You can put a tone in the transceiving menu. The offfset can be use in dual watch mode.

---------- Post added at 04:15 PM ---------- Previous post was at 04:04 PM ----------

First and foremost thank you for the fine tuning mod our home group freq is below 144mhz. I get to benefit from the mod.

If its too much to ask for, can there be a way to have a modification to control the vol not by the power/vol knob?

My Mijia fell and I think the problem is hardware, i tried factory reset anf firmware upgrade but still it just powers on but would not turn the vol up from mute...

Just hoping you can help out before I try to open this radio o solder or resolder parts.

Thanks
[Hardware Hacking General] darkhorse1870:
Theoretically, there definately should be such a way, because Mijia Walkie Talkie volume knob does not control sound volume directly - instead, it sends rotation info to Walkie Talkie's CPU to furner processing.

Unfortunately, while I have some plans about the Mijia firmware modifications, nowadays I am not ready to do such a thing :(. So, it definately will be much, much faster for you to repair the radio, not to wait for software solution.
[Hardware Hacking General] CrisMijia:
Ok thank you. I was just hoping. =)
[Hardware Hacking General] Josh991:
Thanks

I really appreciate it. thank you very much for your hard work.... And now i can use my HT :good:
[Hardware Hacking General] artadita:
Many2 thanks
[Hardware Hacking General] Gaesca:
I have try in the 1s model and don´t work. can you made any hack for this model???

let me put the frequency only up to 440 .... no more so I can not put the 460 ..... please update the app for 1s
[Hardware Hacking General] omadon99:
Is it possible to change Amateur or Public channel lists? I would like to replace Chinese frequencies with Europe ones. Is it possible or this is written in the firmware?

Thanks
[Hardware Hacking General] darkhorse1870:
For 1S, use the 2nd version of application mod: https://xdaforums.com/showpost.php?p=78533983&postcount=30

Unfortunately, according to user reports, frequencies above 440 don't work on 1S - looks like hardware or firmware limit :(

---------- Post added at 03:52 PM ---------- Previous post was at 03:40 PM ----------

It's not a problem - in the 1st mod version, you were able to enter up to 2GHz; but it is pointless: Mijia Walkie Talkie radio chip has 520MHz limit

---------- Post added at 04:02 PM ---------- Previous post was at 03:52 PM ----------

These channels are written in firmware, and to replace them by more useful frequencies is one of my ideas about the further walkie-talkie firmware modifications :)
[Hardware Hacking General] omadon99:
Did you manage to download firmware file so we can have a look at it? Firmware can only be downloaded via app.
[Hardware Hacking General] darkhorse1870:
Surely I did - firmware link could be easely found in the logcat output of MI PTT app ;).

Download English Mijia Walkie Talkie firmware ver. 1.8.8 here:

https://cdn.cnbj2.fds.api.mi-img.com/fengyu-download/mcu_ble_1_7e_188.bin

It is not a raw ROM image - Mijia firmware file is a chain of code blocks with some metadata; 1.8.8 has 2 blocks - CPU and BLE code.
[Hardware Hacking General] stanleysi:
Thx [MENTION=346448]DarkHorse[/MENTION]. I tried 447.25 MHz but can't get it to talk to my original walkie talkie. Either you are right that there's a hardware limitation that locks everything out after 440 MHz or ... I keyed in something incorrectly?
[Hardware Hacking General] stanleysi:
Sorry one of my pictures didnt get uploaded. Here's my config ...
[Hardware Hacking General] darkhorse1870:
It looks like everything is correct. You can do two things:

1) Try to enter 437.25 MHz instead of 447.25 - such a frequency is in officially allowed band, so if you will be able to talk - the problem is definately in Xiaomi 1S limitations.

2) Turn off the subtone - it could be not fully compatible with other walkie-talkie models.
[Hardware Hacking General] stanleysi:
Ok will try that. Looking for another walkie talkie that allows me to change the frequency. Dunno how to do that on my RST (Risiton) walkie.

If I get the V1 of the xiaomi walkie - will it work with my frequencies? I.e. 447.25 with subtones ? I am strongly considering this option ....
[Hardware Hacking General] darkhorse1870:
Surely it will, even without the app : you can enter such a frequencies on the radio itself. On Mijia 1, you can use 20 "custom channels" with the only frequency, without subtone, + 20 "repeater channels" - such the channels are exactly what do you need in : separate frequencies for receiving / transmission, with separate receiving / transmission subcodes.
[Hardware Hacking General] higante:
hi, my mijia can only connect to the Mi PTT ver. 1.1.5 apk.. Other versions including this mod does not connect to bluetooth. hoping for an update. TIA
[Hardware Hacking General] higante:
the mijia walkie talkie firmware is version 1.8.12, which i believe is a global version, got the unit from an official xiaomi store in the Philippines. I was planning to use it with a WLN KD-C1 and a Baofeng BF-T1 radio.
[Hardware Hacking General] heymaula:
Mijia 1S

Can i set Mijia 1S frequency to 174Mhz like the old version? Someone said 1S version only support UHF
[Hardware Hacking General] damn66:
u can but doesn't work coz 1S 430-440Mhz [emoji51]
[Hardware Hacking General] heymaula:
Oh my... glad i haven't buy it yet.. will go for the older version then. Thx very much for your information
[Hardware Hacking General] tcfx44:
465 MHz works in my 1S

Thanks darkhorse1870!

This is a wonderful mod.

I have both the original and S1 radios and they both work perfectly on 465 MHz.

I don't know if this is dependent on certain hardware revisions or firmware versions.
[Hardware Hacking General] higante:
is it possible to update firmware via USB? TIA
[Hardware Hacking General] express315:
400-470 mhz range works on 1S

Confirmed 1S can be programmed in 400-470 range for both TX and RX. Split frequencies for repeater use can be programmed.

My radio has latest V0.15.7 firmware and I used the second version of MI PTT+ on page 3, post #30.

In both original and modified app DELETE function for custom channels is not working. So I had to use factory reset to clear memory after test programming. Power on, hold vol up button, then press ptt for 10 sec. Can be found in the FAQ section of the app.

Thank you very much for MI PTT+ ! Full potential of the radio can be accessed now!
[Hardware Hacking General] darkhorse1870:
For the 1st Mi Walkie-Talkie version, it is possible using bootloader mode; for 1S it should be possible too, but I don't know how to turn on USB connection in Bootloader mode.
[Hardware Hacking General] Tuareg471x:
Hello, is there way to connect Bluetooth headset to this walkie talkie (older version) via Bluetooth ?
[Hardware Hacking General] damn66:
no
[Hardware Hacking General] Hugooz96:
I use Xiaomi Mijia 1S Walkie Talkie, wondering if I can use it with VHF Frequency (136-147Mhz), is it possible?
[Hardware Hacking General] Snow_Rider:
I see some one can be it working to 470 MHz, is it possible to get it up to 478 MHz? The Australian citizen band range is 476.4125 – 477.4125 MHz.
[Hardware Hacking General] damn66:
get the older model..130-520Mhz
[Hardware Hacking General] darkhorse1870:
Nowadays I am testing the modified firmware version for Xiaomi Mijia 1S, which allows the radio to operate as a receiver only (no transmission) in 130-400MHz range, and fully operate in 400-520MHz range.

I'll share this mod here when it will be ready.
[Hardware Hacking General] johngan:
THANK YOU for sharing this mod! :)

Will it be possible to modify the scan function and not include the public chanels and amateur channel? So that when the scan feature is activated, only custom channels will be scanned?
[Hardware Hacking General] tolol:
interesting, waiting fo it to happen :D
[Hardware Hacking General] darkhorse1870:
Mi 1S "no limit" firmware mod

Here it is : https://drive.google.com/open?id=1qrPAOFcsSwcs21sOHE_ohDe-0WnkI-dd

It is a modified Xiaomi Mi1S firmware, which allows to use an entire walkie-talkie radio chip frequency range without any redundant software limitations. As a result, radio works as receiver in 130-520MHz range; transmission frequency range, unfortunately, is limited by the transmitter circuitry to 390-510MHz approximately (could vary from one radio to another).

To install the modified firmware:

1. Download the latest version of my "Mi PTT+" application mod here : https://xdaforums.com/showpost.php?p=78533983&postcount=30 ; install or reinstall it.

2. Unpack "Mi1S-no_limit-19-04-10.zip" file to your phone's internal memory. As a result, you should get "Mi-walkie-talkie.firmware" folder there with 3 files inside (diffirent firmware for 3 Mi1S hardware revisions).

3. Run "Mi PTT+"; connect to Mi1S radio; proceed to "Radio Settings" --> "Firmware Update" and press "Flash <your-firmware-file-name>" button to start firmware update!

4. After finishing the update, close "Mi PTT+" , remove (or rename) "Mi-walkie-talkie.firmware" folder, and reboot the phone (or you can force stop "Mi PTT+" if it is easier for you, it will be enougth). That's all!

Interesting note

It looks like at least some Mi1S radios with my firmware mod are fully operational in VHF range : both receiver and transmitter work OK!

What a surprise! :)

Remember - firmware update is a dangerous operation! I am not responsible for damaging of your hardware; do it at your own risk!
[Hardware Hacking General] damn66:
darkhorse1870

yr point 3. there's no option in firmware selection in M1S firmware update. so how to select the firmware from zip file?
[Hardware Hacking General] tolol:
I can transmit on VHF with this firmware, thanks

---------- Post added at 02:05 PM ---------- Previous post was at 02:04 PM ----------

now you can

https://xdaforums.com/showpost.php?p=79316051&postcount=69
[Hardware Hacking General] darkhorse1870:
Firmware file is selected automatically by "Mi PTT+" according to the connected radio model and revision; text on the button is for information only.
[Hardware Hacking General] damn66:
oic understood
[Hardware Hacking General] damn66:
great work bro..tks so much all freq working [emoji16]
[Hardware Hacking General] damn66:
[MENTION=3834168]darkhorse1870[/MENTION]

will it work with Xiaomi Mijia 2Gen [emoji41]
[Hardware Hacking General] k3341095:
Ask about output power.

1s has two output powers.

public 0.5w / u / v 3W

Over 0.5 in our country is illegal.

채널	주파수	채널	주파수	채널	주파수	채널	주파수	채널	주파수

1	448.7500	6	448.8125	11	448.8750	16	449.1500	21	449.2125

2	448.7625	7	448.8250	12	448.8875	17	449.1625	22	449.2250

3	448.7750	8	448.8375	13	449.9000	18	449.1750	23	449.2375

4	448.7875	9	448.8500	14	449.9125	19	449.1875	24	449.2500

5	448.8000	10	448.8625	15	449.9250	20	449.2000	25	449.2625

The frequency change is possible thanks to ...

What about the output? Is it 0.5? Is it 3W?

If it is 3W, is it possible to limit it to 0.5?

Thank you very much.
[Hardware Hacking General] uranium2k:
Thanks for the mod! Works well for 1 and 1s, but unfortunately it can’t connect to gen2. Would appreciate if you can help add support for gen2 at your own free time!
[Hardware Hacking General] heymaula:
Please make it works for gen2 too :highfive:
[Hardware Hacking General] ARZLEB:
amaaaaziiinggg thank you so much plz keep updating
[Hardware Hacking General] Sasima:
Xiaomi Mijia Walkie Talkie 2-new model…

Re: the new model Xiaomi Mijia Walkie Talkie 2-new model

tried to install on this but no way.

Anybody have info if there is a solution to change into English menu?

tks
[Hardware Hacking General] heymaula:
Hope darkhorse makemake an update so it can works on gen2 too ?
[Hardware Hacking General] stanleysi:
Just wanted to thank darkhorse for helping to make the 1S work with my 447.25 frequency
[Hardware Hacking General] darkhorse1870:
Mi 1S output power is 0.5W in 409.7500..409.9875MHz range and 3W for other frequencies, both for standard and modified firmware; you can easily limit the output power by activating the "power-saving mode" switch in application.
[Hardware Hacking General] ibatnih:
I'm waiting for it too.

Dear darkhorse, please port it to gen 2
[Hardware Hacking General] enchatned:
Me three :) just got my radio.

Any chance this can work with receiever side 118mhz and tx side that low too?

Ideally just rx 118mhz ++

gen 2 :)
[Hardware Hacking General] meekia31:
hi, i downloaded the mi ptt+ but i am unable to login.using the xiaomi account or wechat account. can anyone assist to advice
[Hardware Hacking General] damn66:
why cannot ah
[Hardware Hacking General] meekia31:
not sure bro. it says cannot connect to the network
[Hardware Hacking General] Snow_Rider:
Hi DarkHorse,

I think I managed to install and update the firmware successfully - I can set the channels, however there is heavy static that renders the 1s walkie talkie useless to communicate - I can't hear over the static. When I try on the default channels, this problem does not seem to be there.

Is this static a limitation of the hardware or did I update / install your firmware update incorrectly?

Thanks
[Hardware Hacking General] krupan:
I just set up a 1s with this app and firmware and I don't have any static

---------- Post added at 02:33 PM ---------- Previous post was at 02:27 PM ----------

Does anyone know what the Wideband/Narrowband setting does? More specifically, for typical U.S. ham radio repeaters, which setting should I use?
[Hardware Hacking General] R.Fauzan:
Im waiting to ?✌️
[Hardware Hacking General] master_mage:
Manyy thanks, my mijia 1s fully op in 167.167 freq
[Hardware Hacking General] andpho:
Will it work on MJDJJ02FY? VHF from 136 to 174 MHz. Mostly working on marine frequency on daily basis.
[Hardware Hacking General] Jeah611:
I can't connect my walkie talkie 1 to the app even though I followed all instructions. Pls help. Thanks
[Hardware Hacking General] uranium2k:
Hi, did anyone manage to find a solution for gen 2?
[Hardware Hacking General] Sasima:
Xiaomi Mijia Walkie Talkie 2-new model…

Have same problem for my model 2, I Humbly ask someone to help us with this beautiful w.thalkie.

Thanks in advance
[Hardware Hacking General] jbird0311:
Do u have a link on how to hack xiaomi walkie talkie 2 ?? Need 142. Channel
[Hardware Hacking General] erkamahendra:
Xiaomi MJDJJ02FY

hey, I use the latest model, MJDJJ02FY, and with that mod app I can't connect the app to the radio. So I need to uninstall it and return to the original app. Is there anyone who could help me?

---------- Post added at 02:40 PM ---------- Previous post was at 02:36 PM ----------

Dude, I got an issue for using the latest xiaomi radio. With your app mod, I can't connect the bluetooth at all, so I should uninstall it and return to the old original one. Do you have any updated version for your mod app that could handle the gen 2?
[Hardware Hacking General] jbird031180:
it doesnt work with my xiaomi walkie talkie 2. any suggestions? need freq 142.250
[Hardware Hacking General] Arthurhugomakapuan:
Mi PTT+ for MJDJJ02FY (Mi WT2)

Darkhorse, thank you for your Mi PTT+, it's very useful on my Mi 1S, but can you make it work for MJDJJ02FY (Mi Walkie Talkie 2), pleaseee... I need 142,800Mhz. Thanx before.
[Hardware Hacking General] madefficient.net:
:angel::angel:
[Hardware Hacking General] hamzaarif24:
[MENTION=3834168]darkhorse1870[/MENTION]

Thanks for your amazing work on ptt app,

Does the modified firmware for mijia 1s, allow to edit or delete, public & amateur channels??
[Hardware Hacking General] eijnek:
Any feedback sir? Need to unlock my walkie talkie model a102 version:1.8.12
[Hardware Hacking General] Androu27:
I'm having trouble connecting my Mi Walkie to PTT+ and it cannot find my walkie. 😭😭😭
[Hardware Hacking General] Farid81:
I have new xiaomi

MJDJJ02FY

Please advise how to change frequency 130 - 520 MHz

Thanks
[Hardware Hacking General] 1817as:
Please update to Xiaomi Mijia Walkie Talkie 2

Only you can do it in the world.
[Hardware Hacking General] Arthurhugomakapuan:
Could you update Mi PTT+ for Xiaomi Mijia Walkie Talkie 2 please... Finally I can enter mijia Walkie Talkie 2 with darkhorse Mi PTT+ v2, can save frequency as I want, but not working because frequency limitation, can't transmit or receiving. So please update Mi PTT+ v2, so it can unlock frequency limitation. Please help.
[Hardware Hacking General] Deathaddertripple6:
Hi after i downloaded mi ptt+ but i cant connect witf my pho the Bluetooth doesnt working. Thanks
[Hardware Hacking General] johansisno:
I cant pair my 1st gen walkie to both Mi ptt+ and Mi ptt. My version is 1.8.12. Any of you guys have figured it? Thank you
[Hardware Hacking General] darkhorse1870:
I've updated my MI PTT+ mod to 2.9.34 version; mod should be fully compatible with Mi Walkie Talkie 2. See the original post : https://xdaforums.com/showpost.php?p=78533983&postcount=30

Also, MI PTT+ mod project sources are available on Github now : https://github.com/Mi-Walkie-Talkie-by-Darkhorse/Mi-Walkie-Talkie-Plus

Attention!

The app mod itself does not extend the walkie-talkie frequency range; you'll also need the modified radio firmware!

Work in progress for the Walkie-Talkie 2 firmware.

Please be patient! ;)
[Hardware Hacking General] darkhorse1870:
Xiaomi Mijia Walkie Talkie 2 firmware mod

Here it is : https://drive.google.com/file/d/1Np9tbz_SSX7bYDq_1G7uCmmM9MK2783r (updated 12/24/2019)

It is a modified Xiaomi Mi2 (MJDJJ02FY) firmware, which allows to use an entire walkie-talkie radio chip frequency range 130-520MHz for the user channels, without any redundant software limitations (the actual frequency range, though, is limited by the radio circuitry and could vary from one radio to another).

To install the modified firmware:

1. Download the latest version of my "Mi PTT+" application mod here : https://xdaforums.com/showpost.php?p=78533983&postcount=30 ; install or reinstall it.

2. Unpack "Mi2-nolimits-20191223.zip" file to your phone's internal memory. As a result, you should get "Mi-walkie-talkie.firmware" folder there with the firmware file "shark_1.0.4-mod-nlt_hw2.bin" inside.

3. Run "Mi PTT+"; connect to Mi2 radio; proceed to "Radio Settings" --> "Firmware Update" and press "Flash 'shark_1.0.4-mod-nlt_hw2.bin'" button to start firmware update!

4. After finishing the update, close "Mi PTT+" , remove (or rename) "Mi-walkie-talkie.firmware" folder, and reboot the phone (or you can force stop "Mi PTT+" if it is easier for you, it will be enougth). That's all!

Remember - firmware update is a dangerous operation! I am not responsible for damaging of your hardware; do it at your own risk!

Mi 2 firmware files with the related disassembled sources are awailable on Github now: https://github.com/Mi-Walkie-Talkie-by-Darkhorse/Mi2-firmware ; feel free to send me a pull request if you are interested in firmware mods development.
[Hardware Hacking General] uranium2k:
Greatly appreciate your contributions!
[Hardware Hacking General] damn66:
darkhorse1870

You the man!!!
[Hardware Hacking General] jme2019:
Hello, is this also with an Apple / IOS phone?
[Hardware Hacking General] karina1234:
Tes

I am use it,I can receive frek 136 - 143 , but I cant transmit, because the power O watt

---------- Post added at 01:33 PM ---------- Previous post was at 01:12 PM ----------

How can I use in frek 136 -143 mhz, I can received but I icant transmit because the power O watt, please update new version.
[Hardware Hacking General] darkhorse1870:
Walkie-talkie firmware modding is not an easy peasy, I could messed up something :eek:.

Could you check please, what about the transmission power above 470 MHz ? If it is 0 watt too, I probably know what to fix!

Unfortunately, I do not have the Mi Walkie Talkie 2 radio, so I can not check it by myself .
[Hardware Hacking General] karina1234:
In frek uhf 400 - 500 mhz we can use power 3 - 4 watt

In Vhf 144 - 148 mhz we can use 3- 5 wattt

In 136 - 143 mhz = 0 watt

149 mhz - 175 mhz = 0 watt
[Hardware Hacking General] Ea7alp:
Sigue bloqueo

With the new firmware it is only possible to modify the frequency from the app since the walkie is still locked apart from what is indicated as low or no power
[Hardware Hacking General] Arthurhugomakapuan:
Darkhorse, thanks for your effort to make this update, working hard for this update, I realize this is not easy to make this update and all stuff related to unlock Mi Walkie Talkie 2 frequency. But isn't yet work perfect, some frequency has no transmit power. I use 152.00 and 157.00 MHz as repeater frequency but isn't working, but 142.80 MHz working flawless. So I do appreciate your effort to make this update. And I'm waiting for next update, so it can work in all frequency. Thank you very much Darkhorse.
[Hardware Hacking General] darkhorse1870:
Bugfix : https://drive.google.com/file/d/1Np9tbz_SSX7bYDq_1G7uCmmM9MK2783r

Origial post https://xdaforums.com/showpost.php?p=81237095&postcount=111 has been updated too.
[Hardware Hacking General] karina1234:
Ok good job bro. Im use it very well. Its can transmit . Thank for your job
[Hardware Hacking General] HugoCata:
S1 (mjdjj03fy)

Darkhorse, I need to modify the firmware of the S1 model (MJDJJ03FY), to work at frequencies 140-180 mhz. It's possible? What I can do?. Thank you so much
[Hardware Hacking General] darkhorse1870:
You can read the thread :)

https://xdaforums.com/hardware-hack...kie-talkie-t3840164/post79316051#post79316051
[Hardware Hacking General] HugoCata:
I read the thread before and tried to follow the instructions, but I think I shouldn't have done it correctly. I am not sure which files should be inside the mi-walkie-talkie.firmware folder. When I tried to do it in step 3, it did not give me the option to press "flash ..." but the firmware was directly updated to another version with a message that appeared to me in Chinese. Therefore, I think there is something I am not doing well. On the other hand, when using the "MY PTT +" application, the fine adjustment does not appear when creating a channel.

Thanks for your help.
[Hardware Hacking General] grayswander:
Hello!

I have the version 2 of Mi Walkie Talkie (MJDJJ02FY).

I've updated the latest firmware, provided by you, but the language remains Chinese.

Do you have any ideas on how to switch to English?

Phone language is English.

Thank you in advance!
[Hardware Hacking General] karina1234:
In setting. Language and time
[Hardware Hacking General] lazyprint:
From Thailand. Thank you very much.
[Hardware Hacking General] HugoCata:
I finally got it, my s1 work at 140-160 mhz. Thank you very much from Spain.

Darkhorse, You're the best ;):good:
[Hardware Hacking General] 1817as:
you are perfect [MENTION=3834168]darkhorse1870[/MENTION]:
[Hardware Hacking General] Guantenk:
Very Big Thanks Darkhorse.

Darkhorse. Such an amazing work on this thing.

Another additional imagination to have this walkie talkie to have an open squelch function, assigned to one of the buttons or somehow, like a monitor button in common HT.

Since it only has two squelch level.

I wonder ..... ?
[Hardware Hacking General] damn66:
darkhorse1870,

my Mi2 after upgraded to the hack firmware works fine but all the selection buttons not working except PTT button. can only change frequencies and some functions via MiPTT+. any suggestions?
[Hardware Hacking General] Sasima:
Xiaomi Mijia Walkie Talkie 2-new

Hi, Same as grayswander,

I have the version 2 of Mi Walkie Talkie (MJDJJ02FY), but after

flashing: "Flash 'shark_1.0.4-mod-nlt_hw2.bin', my menu remain in chinese, any idea to

solve? Tnks
[Hardware Hacking General] Mortalink:
Question firmware

Hi,

First thank you for your work [MENTION=3834168]darkhorse1870[/MENTION]!

I have a question, it seems like after using your mi PTT+ and the firmware I can set through the app the frequencies I want but I can't do it directly through the Walkie Talkie menu, is it normal, if yes is it possible to adjust the firmware to unlock that?