61 replies on What is firmware? What does firmware do?

  1. Doss says:

    Thanks for the useful article.
    I’m wondering about firmware rollbacks. Why is so difficult to perform them? Can there be any type of firmware where an update becomes ‘hardwired’ and impossible to undo?

    • Ciprian Adrian Rusen says:

      You don’t rollback firmware. You just rewrite it with the same version or another version (new or old).

      • Dave says:

        Hi, my phone frequently misses texts. People send but the phone doesnt receive. Different people, different time, etc. No detectable pattern. I was wondering if the os might be corrupted. There is an update for my firmware now. When I update does it completely rewrite the firmware, or just certain things? Thanks.

      • shubham says:

        yes, we have no roll-back option in firmware case, we need to re-install old version on it. SO before updating new version you must keep backup of old version. so it would be very helpful in this type of case.

    • Anonymous says:

      I think you mean to undo the update, right?

  2. james says:

    thanks helped alot

  3. jp says:

    that was a brilliant simple explanation. thank you. you went just about as deep into the theory and the application as I needed to get a broad understanding. The pictures were great visual tools as well.

  4. DMD says:

    Thank you that was very helpful period I’m not very tech-savvy period I just got my first smartphone 1 year ago. When I see a message on my Galaxy instructing me to download firmware… I got nervous. I still have a question. Is it possible for some maniac to insert a message on my smartphone telling me it’s firmware and perhaps it is not for the good of my phone or for me? If the firmware doesn’t identify where it comes from and you can’t fully vet it – how do you know it’s not some hack trying to put a bug in your phone? Thank you in advance.

  5. Abayomi says:

    it was well explained and with the tutorial, i now have the in dept knowledge of what firmware is all about. Thanks

  6. Donna Roush says:

    My phone wants to uninstall the Motorola sensor services firmware…what does this mean?

  7. Pamela B. says:

    Thanks for giving a simple explanation of firmware to a newbie. I will definitely share this site. Have a Blessed day!

  8. mdutta says:

    Was very useful.

  9. Narendra says:

    Very much helpful!

  10. Tomor says:

    Though it’s an excellent article and it explains very well, it’s a bit hard for me to understand firmware because I am beginner in this subject (IT overall).

  11. Sibyl says:

    Would be useful to have an answer to:
    Submitted by DMD on Tue, 05/09/2017 – 16:22. There is a comment from the tech further down but it is not related to a serious question – how do you know that an update email is genuinely from the provider?

  12. Gary says:

    Can the same phone from different carriers have different firmware ?

  13. Ajibola says:

    Please by understand is firmware responsible for some bloatware app that doesn’t work on other phone brand? If yes can I install other phone firmware into my own phone brand? Thanks

    • Ciprian Adrian Rusen says:

      You should not install the firmware of another phone onto your phone. The firmware contains the code required for the hardware on your phone to do what it is supposed to do. If you install the firmware of another phone, yours will stop working or it will work but with many problems and errors.

  14. Scratch says:

    It’s very informative. Keep up the good work.

  15. John Akeredolu says:

    Thks for the very clear and understandable explanation.

    • Ciprian Adrian Rusen says:

      You are welcome. Don’t hesitate to subscribe to our newsletter and get daily tutorials.

  16. santosh says:

    Thanks for the useful article.

  17. Rana says:

    Firmware is programming that’s written to a hardware device’s nonvolatile memory. Nonvolatile memory is a form of static random access memory whose contents are saved when a hardware device is turned off or loses its external power source.

  18. LadyDi says:

    Thanx for this article!

  19. marina says:

    Why it is not enough processor that tell what to do to device?

  20. ChuckyB says:

    Excellent article. Clear and concise.

    • Ciprian Adrian Rusen says:

      Thank you for appreciating our work. Don’t hesitate to subscribe to our newsletter and get access to more useful tutorials.

  21. preethi says:

    A lucid and excellent explanation!

  22. Richard Giannamore says:

    A great explanation – nice work!

  23. getbackshorty@gmail.com says:

    can firmware be used to eavesdrop thru wi fi

  24. Az says:


  25. hdimantha says:

    Really good explanation and thank you very much for this article.

  26. Larry says:

    Yeah but what does it do?

  27. Mehak says:

    Well explained!

  28. Ashok Sharma says:

    this is how you explain….other people just keep on defining software, hardware and firmware … but no one said if no firmware in electronic device it is dumb and won’t function or will be just like electric switch…on and off..

  29. Mohamad says:

    Thanks a lot

  30. Amit Kumar says:

    It is a very good article. Comparison clears confusion.

  31. Mithila Rai says:

    Thank you for such a clear sighted info on firmware. Doesn’t seem alien to me anymore.

    • Anonymous says:

      Don’t hesitate to subscribe to our newsletter and get daily tutorials with other useful content.

  32. Mateus Possatti says:

    Excellent article, with a perfect didactics. In particular, the part about smartphones was extremely enlightening, it helped me a lot!

  33. Shuva says:

    Thanks for the article it helped a lot :).

  34. Raul Souza says:

    Thanks for the useful article. Great explanation!

    • Anonymous says:

      Happy to help. Do not hesitate to subscribe to our newsletter, for more useful articles.

  35. Azhar Yasin says:


    This is Azhar from India.
    Just wanted to drop in a word of thanks for the manner in which you have put forward the concepts making it very easy to understand.

    God bless u…. Keep up the good work

  36. Bj Bright says:

    I would like to know more…

  37. JGH says:

    Very good explanation. Well done! The meaning of the term ‘firmware’ is, is now clear to me.

  38. Denise Carvalho says:

    Thanks, this toturial helped me a lot.

  39. MJ says:

    What does firmware do on my computer?
    I’m a bit illiterate around these things. I was asked to update my brother printer and now its asking about firmware.

  40. AJAY says:

    Very nicely explained!

  41. Vanshika says:

    Awesome explanation!

  42. PD Gupta says:

    I recently had a Firmware update in a book scanner, CZUR ET series, that was done remotely by the manufacturer of the device. It is a versatile and good scanner for archiving old books, manuscripts, etc. I was having problems while scanning when I used a hand button and or a foot paddle (USB connection to the scanner). Scanning was interrupted due to complete freezing of the scanning application. However, I did not have any freeze when I was using the computer mouse instead of the scanner buttons. My computer system was Mac OS 10.14.X. Amazon agreed to replace the scanner with a new one without a fuss. It was beyond the money refund period. I did not want to get a refund. Other brans similar scanners cost much more and I needed a book scanner. But I did not know whether the new replacement would have the same issue. I contacted the manufacturer. Our time difference is +12 hours. The manufacturer told me that a special tool would be needed to fix the problem remotely. There was no need to send the scanner back for repair. The manufacturer send a link and I had to install TeamViewer software and created an account. I gave my account information, a static user ID and a dynamic PW from TeamViewer application, to CZUR. The scanner was attached to Mac via USB port. I had to sit at night and someone from the other end gave me step by step instructions (Chat conversation within TeamViewer application) to update Firmware in CZUR scanner. It took about 15-20 minutes for Firmware update. Since then I tested the scanner once only. I did not encounter any freeze when I used the scanner button and Magic Mouse. It seems Firmware update is very important. CZUR scanner is new in the market and thus it needed regular Firmware update to workweek with every OS. I perhaps do not need a replacement scanner anymore. Though, I have not received it yet, I have been thinking to cancel the replacement order after testing the scanner a few more times. This is a very nicely written Firmware article. Thank you!

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