How to update the F4/F6 firmware manually

August 28th, 2017


Recently NO.1 releases the F4, the multi-sport mode bracelet.

It is a pity that the companion app Fundo Pro can only support English and Chinese, so does the bracelet. We received some feedback about this, it is important to include other languages in the app. So we’re now doing the translations. But not the bracelet, you know, there are only several words in bracelet, you can even guess the function via the icons. So we are going to release a new firmware for F4, to delete the words under the icons.icon

*This method also works for NO.1 F6, you can download the F6 firmware here*

So if you receive a F4 with the words under the icons, if you mind the English display, you can follow this tutorial to update your F4 to a pure version.

  1. Download the Nrf Master Control APP and the firmware here. Or the version 2.3, the latest version 2.6.(this version fixed the pedometer issue.)
  2. Extract the file, install the Nrf Master control app in your phone, don’t unzip the F4_20170826 firmware.
  3. Find the correct Mac address, connect it.
  4. After the connection is successful, click the Unknown service.
  5. Click the unknown characteristic
  6. Input the value 42, click send.
  7. Click the ‘X’ button, then refresh the app to find the DfuTarg, connect it.

  9. Click this button then go to this window to choose the firmware.
  10.  Screenshot_20170828-172723_1 Screenshot_20170828-172723_副本 Screenshot_20170828-172734 Screenshot_20170828-172752_副本
  11. Waiting for the update process


Done. If you failed to update, the bracelet will  reset after 3 seconds it will boot.


You might also like


  • Phat Le Tan

    Apr th, 2018 11:46 AM Reply

    I just bought two of F6 for me and my wife but i encouraged with a probrem, our app did not save steps and sleep report. And after end call i get a notification.
    I use an adroid phone samsung J7 Prime.
    Please fix this issues asap.
    Thank so much!

    • Jon

      Apr th, 2018 11:50 AM Reply

      Hello Phat, did you find the steps/sleep report on the watch? If it is recorded on the watch, you just need to connect the watch to your phone and make sure the data has synced to the phone successfully.(You can click the Sync button or unbind and reconnect)

  • Jon

    Apr th, 2018 11:00 AM Reply

    We just release a new version 2.6, this version fixed the pedometer issue.
    Download it here.

  • Tihi

    Mar th, 2018 7:41 PM Reply

    HI! I have a problem whit my F4.after the last update, the application fails to work and can not connect to my f4 bracelet

    • Jon

      Mar th, 2018 11:57 AM Reply

      Hello Tihi, u just need to unbind the device and reconnect it.

  • szkraft

    Jan th, 2018 6:19 PM Reply

    HI! I have a problem whit my F4. Do you know anything about Huawei P8 lite connection problem? I can see the watch, but always fail the connecting.

    • admin

      Mar th, 2018 4:13 PM Reply

      You can watch this video about how f4 connect to phone.

  • Pedro

    Jan th, 2018 4:37 AM Reply

    Hi I want to translate the interface to Spanish (the date formatt and the days of the week) there is an file where I can get that? Or do you know how can I help you?

    • Jon

      Jan th, 2018 10:03 AM Reply

      Hello Pedro, thanks for your concern. I’ve a question what is Spanish date format, usually we use year/month/day.

      • Pedro

        Feb st, 2018 1:57 PM Reply

        Hi, the normal format here (es_MX) is dd/mm/yyyy and also I preffer the 12 hours format with AM, PM, I would love if there are an option for that. Also I don’t know how to update the weather information because sometimes I travel to another places.

        • admin

          Mar th, 2018 11:46 AM Reply

          The time format show syncs with your phone, so you can just set phone then connect watch.

  • Jenna

    Jan th, 2018 8:44 PM Reply

    Hi I’m having trouble using the sleep option? It’s not doing anything over night? I’ve tried just leaving it to log manually & I’ve actually tried clicking on the sleep icon to see if it logs it that way. But it’s not logging anything. 🙁
    I’ve also done the latest update. Thanks

  • Isaac

    Dec th, 2017 4:26 AM Reply

    No me aparece ninguna ventana al hacer click en características desconocidas para introducir el valor 42, que puedo hacer?

  • Juan

    Nov th, 2017 9:06 PM Reply

    hello dear

    Please could you upload the latest version of firmware? I think is v2.2

    Many thanks

    • Jon

      Nov th, 2017 10:26 AM Reply

      Yes, but everyone said that 0.1.8 version is the best one. :p So you would like to use the latest one? Actually you just need to use the Fundo Pro to update it.

      • adrianrizaldi

        Jan st, 2018 4:46 AM Reply

        Please Advise i have done update manualy . where sleep monitoring on 0.1.8 thank

        • Jon

          Jan nd, 2018 3:40 PM Reply

          Hello adrianrizaldi, there is a new version. Sorry, I just found I did not put the latest one here. I edited the link, you can now download it there.

  • renan

    Oct th, 2017 3:43 AM Reply

    good afternoon,
    I bought a smartband x2 after I gave the error in the update and I used this rom in it, I was able to install the rom but everything was zapped. The screen of the smatband is 96×96 and these were one of the reasons to get bad with this rom (firmware), how could I make a firmware for me? because I can not use my watch.

    • Jon

      Oct th, 2017 11:52 AM Reply

      Hi renan, sorry I don’t know where you can get the firmware for your watch, maybe the seller can help you.

Leave Your Comment