Formuler z12 Randomly Rebooting Even After Factory Reset

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1st Official Post

    Hello,

    I’m experiencing an issue with my Formuler box, it keeps rebooting randomly while using different apps such as YouTube, MyTV3, and Emby.

    I’ve already tried:

    • Performing a factory reset
    • Changing the HDMI cable
    • Testing on a different TV
    • Update last version
    • turn off 30 seconds

    Unfortunately, the problem continues. I bought the box 2 days ago, and it worked perfectly during the first two days. The reboots started only recently, and I’m not sure if it might be related to a recent software update or something else.

    Could you please help me identify the cause?

    I saw in some articles here that Formuler staff asks for Tracking, mine is 0000001FE01FA and i have sent the logs.

    • Model: Formuler z12
    • Retail Box or Provider Box: I dont know...i bought it from Kontrolsat online store
    • Firmware version: v12.10.2
    • MYTVOnline: 3
    • Connection with provider: IPTV credentials, emby, prime
    • Box connected with: Wifi
    • Did you factory reset your device? and when?: Yes, 2 times. Via os and via pressing box button
    • What issue(s) are you having? Box reboots\crashing randomly
    • What was you expecting to happen? Not rebooting\crashing
    • What happened instead? Box reboots\crashing randomly
    • How can we reproduce the issue you are having? Just seeing Mytv3, emby, youtube.... can't force it
    • What have you tried if anything to rectify the issue? Yes, reboot, factory reset, turn off 30 seconds, changing hdmi cable

    I'm honestly getting disappointed... since it's not a cheap box... =(

    Thank you for the support and time

    • Official Post

    Could you follow the guide below and send the logs?

    💡 HOW TO

    1. Download an attached file '_dump_log.zip' to your PC and unzip it. (File should be _dump_log)
    2. Format a USB flash drive as NTFS or FAT32
    3. Copy the _dump_log file(no file extension) to your formatted USB root (without parent folder)
    4. Insert the USB containing the _dump_log folder into your device
    5. Power on your device and reproduce the issue
    6. Wait about 1 minute and remove the USB and connect it to your computer
    7. Send the logs to me via email at [email protected]

    F_Peter

    My brand new Z12 ultra has the same frequent random rebooting problem. Is this een known issue that you are working on?

    And if so what is the status on a fix. Is there very soon a firmware update release with a fix?

    Otherwise I return the Z12 and buy a Z11 max pro BT.

    Edited once, last by geohans (November 7, 2025 at 7:40 PM).

    I was experiencing the same issue. I disabled the CEC and switched to passthrough the audio to my soundbar and everything started working without issues. It might be a problem with the CEC - Audio causing some reboots.

    • Official Post

    Users that have reboots, please follow Peters request and do like posted from him. It is very important to get from affected users the log file so the devs can check why this happens and can create fix before next update comes. Thank you.


    Could you follow the guide below and send the logs?

    💡 HOW TO

    Download an attached file '_dump_log.zip' to your PC and unzip it. (File should be _dump_log)
    Format a USB flash drive as NTFS or FAT32
    Copy the _dump_log file(no file extension) to your formatted USB root (without parent folder)
    Insert the USB containing the _dump_log folder into your device
    Power on your device and reproduce the issue
    Wait about 1 minute and remove the USB and connect it to your computer
    Send the logs to me via email at [email protected]

    I have tried more than 10 times, the log file is empty. I have tried different usb drive.

    Is there anyone who have the same issue who could send log?

    • Official Post
    Quote from geohans

    F_Peter

    My brand new Z12 ultra has the same frequent random rebooting problem. Is this een known issue that you are working on?

    And if so what is the status on a fix. Is there very soon a firmware update release with a fix?

    Otherwise I return the Z12 and buy a Z11 max pro BT.

    do you have any external devices connected? Also, please let us konw if you are using wifi or ethernet.

    Dear users I had the z10pro always a good product but no Dolby vision with kodi en hdr10

    The upgrade to the 12 pro plus looks like a great step forward but indeed it is fast but I also experience reboots very often.

    I try everything like suggested above, but the device keeps randomly rebooting..

    But after done reading and testing I found out that the problem is hdmi switching when using mytvonline 3, the 12 pro is Connect to amplifier and I found out if I start mytvonline watching TV and then switch to another source and switch back the 12 pro reboots. I can repeat this every time.

    If I close my tvonline completely( so no background ) and do the same it never reboots.

    So the problem is my tv online 3, the same equipment but then with the z10 pro on the same hdmi port / cable no problem at all.

    Also with kodi 4K dolby vision / Atmos playing movie on the z12 pro and switch to a diverent source no problems.

    So something with hdmi switching and mytvonline 3 is causing 200% the problem.

    I hope you can fix it because then it is the best box on the market, fast and picture and audio great

    Ps hdmi cec in the android settings is turned off all functions.

    Connect box direct to tv and hdmi arc to sounbar/soundsystem

    • Official Post
    Quote from Bikara

    Hello, I have the same problem with my Z12 Ultra, which restarts from time to time! Have you found a solution? I had the Z10 and then the Z11 and never had any problems.

    Bikara  Fastpeter25

    Could you let me know the information below

    1. your region (NA? EU?)

    2. Do you have any external devices connected to the Z12 Ultra?

    3. Which network connection are you using? Wifi? Ethernet?

    Quote from sultan7swing

    I was experiencing the same issue. I disabled the CEC and switched to passthrough the audio to my soundbar and everything started working without issues. It might be a problem with the CEC - Audio causing some reboots.

    Thx Mate, I already disabled CEC and had the same issue. It helped me to enabled CEC, and wow, the reboot cycle was so high now, almost every 5minutes. then i disabled CEC again and it was for 4 hours stable. i will keep you updated.

    but come on formuler, fix that soon!


    my setting:

    tv samsung,

    sonos sub and sonos arc ultra (hdmi)

    wifi

    nothing elese, latest firmeware updated

    • Official Post

    Do you use some other HDMI Cable than the from Formuler Z12? Other user issues stopped after he used the Z12 Cable, just a hint.

    • Official Post
    Quote from Bikara

    Fastpeter25 I am in France and I have nothing connected to the Z12. I have HDMI, and I am connected via Ethernet cable.

    Quote from Bodmedia

    Z12
    UK
    Hard Wired
    No External Devices
    Reboots happening often

    Quote from JKoma

    not thats not the solution, i use all the original cables.

    I know it can be a little difficult if the reboots happen at random times, but please try to follow the steps below to get the logs, and send it to me via email.


    1. Insert the USB (formatted to NTFS or FAT32) to your computer.
    2. Create a new folder named _logdump
    3. Insert the USB to your Z12 Ultra
    4. Reproduce the issue
    5. Wait about 1 minute and remove the USB and connect it to your computer
    6. Find the logs automatically saved in the '_logdump' folder, and send it to me via email [email protected]

    Quote from F_Peter

    Bikara  Fastpeter25

    Could you let me know the information below

    1. your region (NA? EU?)

    2. Do you have any external devices connected to the Z12 Ultra?

    3. Which network connection are you using? Wifi? Ethernet?

    1 EU / NL
    2 No
    3 Lan

    And this only happens if i a use Mytvonline 3 and switch from hdmi source of put of the tv for longer than 10 sec, if i turn it on the Z12P reboots
    i can repeat this step every time, if i close MY tvonline 3 than there is no problem of reboots.

    • Official Post

    Devs are aware of it and working on fixes.

    Btw. do you use original Z12 Cable or some other?

    • Official Post
    Quote from Fastpeter25

    Can we have a reaction / solution please this problem is very serious please

    If you can, please provide the logs following the instructions below:

    1. Insert the USB (formatted to NTFS or FAT32) to your computer.
    2. Create a new folder named _logdump
    3. Insert the USB to your Z12 Ultra
    4. Reproduce the issue
    5. Wait about 1 minute and remove the USB and connect it to your computer
    6. Find the logs automatically saved in the '_logdump' folder, and send it to me via email [email protected]

    It will help us to analyze the issue more clearly.

    Quote from JKoma

    if the devs are awere of it, why do you need the log files anymore?

    Them being aware of the issue does not mean they know the root cause and can start with creating a solution. So work with them and send them your logs so they can analyse the logs and start working on a solution.

    • Official Post

    In such cases are each user log file important to analyse, please create and send log file to Peter. Thank you.

    Quote from LDeacon

    I just started getting this using Kodi with plex addon to play dolby vision. Very annoying :frowning_face:

    Hard to replicate as it's random.

    Goodday my friend,

    I noticed that in kodi you need change a setting for the black screens from dolby vision .mkv movies begin this year. Maby it helps? Trying worth.

    Start kodi, cogwheel, player, scroll down to "basic" in bottom left corner. Press 3 times OK button till "basic" is changed to "Expert".

    Go to video's, scroll down on right side till you see: dolby vision compatiblemodus. Set the switch ON.

    Then you can go back and close kodi and try again?

    Quote from Lucky133

    Goodday my friend,

    I noticed that in kodi you need change a setting for the black screens from dolby vision .mkv movies begin this year. Maby it helps? Trying worth.

    Start kodi, cogwheel, player, scroll down to "basic" in bottom left corner. Press 3 times OK button till "basic" is changed to "Expert".

    Go to video's, scroll down on right side till you see: dolby vision compatiblemodus. Set the switch ON.

    Then you can go back and close kodi and try again?

    Yes had this on already.

    Quote from LDeacon

    I just started getting this using Kodi with plex addon to play dolby vision. Very annoying :frowning_face:

    Hard to replicate as it's random.

    Maby idea to buy a 2tb or 4tb ssd drive.

    Download/put movies on it and play it without plex.

    I used plex years ago. Didn't like it.

    Maby i will give it a try again my friend.

    But now i download movies from spotnet to my self made Network Attached Storage (NAS) from a raspberry pi 5.

    Works like a charme.

    No plex needed. On formuler z11 and z12 installed file manager plus app and with this app i can connect to my nas and play movies with Kodi.

    Great system.


    Goodday my friend.

    Quote from LDeacon

    Box currently doesn't support proper dolby vision and audio formats without playing through kodi.

    Mxplayer it's the problem itselfs. The passthrough don't work for years.

    Vlc player on Z12 and Novaplayer works, but if you speed forward the movie, it's glitchy yes and will hang with a terrible hard scratching sound, and color become strange and go back to desktop or reboot after 20 seconds.

    So i use kodi so long, till update of vlc player or nova player or Z12 firmware.

    Edited 2 times, last by Lucky13 (November 21, 2025 at 1:05 PM).