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HTC Desire 12 - Can't Start: Stuck on COTA Data Processing & Fastboot Mode Issues

PawelGl 8946 11
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  • #1 17203829
    PawelGl
    Level 2  
    Posts: 2
    Rate: 6
    Hello, I can not start HTC Desire 12. "Normal" starts up with the message "COTA data processing", which takes a few hours and nothing happens. I tried to reset the phone, but I encountered more problems. The combination of Vol.down + power: I see "Fastboot mode" and nothing more. The Vol.up + power combination: a lying robot with a red exclamation mark and no command is displayed. What can I do with this. Please help.
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  • #2 17204371
    br501
    Level 15  
    Posts: 157
    Help: 14
    Rate: 56
    When the robot is displayed, press the buttons again. The recovery menu should appear and then select reboot system now
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  • #3 17204419
    PawelGl
    Level 2  
    Posts: 2
    Rate: 6
    After pressing the same combination, the phone reboots itself to the lying robot.
  • #4 17206489
    noozek
    Level 1  
    Posts: 1
    I have the same problem with the same phone. The only thing I can do is to quickly enter the pin, which works in some way. I have not tried anything else, because I am able to start the phone, and if sometimes I do not manage to do it, I just restart the phone.
  • #5 17206639
    nutergsm
    VIP Meritorious for electroda.pl  
    Posts: 8429
    Help: 1031
    Rate: 1658
    Download the firmware again.
  • #6 17213233
    eedi75
    Level 1  
    Posts: 1
    It also has this problem and after displaying this message I press the "powera" and choose "restart" and the android works.
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  • #7 17216961
    kubad2811
    Level 1  
    Posts: 1
    Rate: 6
    I found a way !!
    Just insert the SIM card and restart the phone :)
  • #8 17386190
    00S
    Level 13  
    Posts: 152
    Help: 2
    Rate: 11
    Did anyone find any other solution to this problem? Unfortunately, inserting or lining the SIM card does not give anything, and restarting does not.
    HTC Sync can not see the phone, even under fastboot or Recovery mode.
    The phone switches on to the code input screen and the message COTA Data Processing appears immediately ...

    Even if you upload new firmware, how and where?

    I still have to try the hard reset option, but I would prefer to recover my data somehow.
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  • #9 17386893
    mobista
    Level 35  
    Posts: 3300
    Help: 257
    Rate: 365
    This is a fresh model - data is definitely crypted, so it will not be easy to recover if possible.
  • #11 17393694
    00S
    Level 13  
    Posts: 152
    Help: 2
    Rate: 11
    Well, unfortunately, the model is not enough, that fresh is still not popular and not from the top shelf ... :P
    But you can see some firmware already found.

    Fortunately, I managed to make it usable without loading anything, even without restoring the factory settings.
    I just tried to run it in safe mode. When it was turned on, with the message "COTA Data ..." displayed, I kept the power button pressed, after the window appeared with the selection of switching off the phones, or restarting it, I held the "restart" option for a while until the message about starting in emergency mode, which of course I confirmed.
    I do not remember whether the phone immediately started up to the system, or if I had to quickly enter the PIN code to run, or repeat the procedure with emergency mode again ... but eventually the normal system turned on without this annoying error. I was able to connect to WiFi and update the software (relevant information showed up), the phone started again and for now it works as nature wanted. ;)
  • #12 17587469
    gumstg
    Level 1  
    Posts: 1
    nutergsm wrote:
    Download the firmware again.
    |
    Good luck how you can find softa and programs for it. I have a desire for myself 12 and there is no softa to him which can be uploaded from the PC level
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Topic summary

✨ The HTC Desire 12 is experiencing startup issues, getting stuck on "COTA data processing" and encountering problems in Fastboot mode. Users suggest various troubleshooting methods, including pressing button combinations to access recovery mode, restarting the device, and inserting the SIM card. Some users report success by entering the PIN quickly or using safe mode to bypass the error. Others recommend downloading new firmware, although concerns about data recovery arise due to encryption. The discussion highlights the challenges of finding compatible software for this relatively new and less popular model.
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FAQ

TL;DR: Stuck on "COTA data processing"? A 3-step Safe Mode fix restores boot; "the normal system turned on without this annoying error." Update afterward to stop the loop. If Recovery shows a robot, re-enter and choose Reboot. [Elektroda, 00S, post #17393694]

Why it matters: This FAQ helps HTC Desire 12 owners fix COTA/fastboot loops fast and understand data-safety trade‑offs.

Quick Facts

How do I fix HTC Desire 12 stuck on “COTA data processing” without losing data?

Use Safe Mode, then update the system.
  1. On the COTA screen, hold Power, then press and hold Restart. Confirm Safe Mode.
  2. Connect to Wi‑Fi and install the offered system update.
  3. Reboot normally; the loop should clear. Keep the battery charged during updates. This restored normal boot in a reported case. [Elektroda, 00S, post #17393694]

How do I get past the red triangle Android robot to the Recovery menu?

When the robot appears, press the hardware buttons again to reveal Recovery. Then select Reboot system now to exit the loop. If it returns, repeat and consider Safe Mode plus update. [Elektroda, br501, post #17204371]

Can inserting a SIM card really fix the COTA loop?

Yes. One user resolved the issue by inserting a SIM card and restarting the phone. Results vary, so this may not help every unit. If it fails, use the Safe Mode update method instead. [Elektroda, kubad2811, post #17216961]

I can reach the PIN screen, then COTA appears. Is there a quick workaround?

Quickly enter your PIN to get to the home screen before the COTA screen loads. If it fails, restart and try again. Use the access window to back up essential data. [Elektroda, noozek, post #17206489]

HTC Sync doesn’t detect my phone in Fastboot/Recovery. What now?

This edge case is common with this fault. HTC Sync may not see the device in Fastboot or Recovery. Prioritize on-device fixes: Recovery reboot, Safe Mode update, or SD‑card update. Use a PC only after normal boot returns. [Elektroda, 00S, post #17386190]

Where can I get firmware and how do I flash it on Desire 12?

Use the SD‑card update method referenced in the thread. Follow the linked guide for your exact model and variant. Mismatched packages can fail or block updates, so check region and build. [Elektroda, oMATRIXo, post #17387372]

Will a factory reset delete my encrypted data? Can I recover anything first?

Yes. A reset erases the device, and encrypted data stays inaccessible without unlock credentials. As one expert put it, “data is definitely crypted.” First restore boot, unlock, and then back up before any reset. [Elektroda, mobista, post #17386893]

How do I enter Fastboot/Recovery with buttons on the Desire 12?

From power off, hold Volume Down + Power to enter Fastboot mode. Use Volume Up + Power to show the robot and Recovery. If it loops, repeat and try the Recovery menu again. [Elektroda, PawelGl, post #17203829]

Rebooting from Recovery didn’t help. What else should I try next?

Boot into Safe Mode and install the pending system update over Wi‑Fi. One user confirmed the loop cleared after that update and reboot. Keep the device charged throughout. [Elektroda, 00S, post #17393694]

Why does “COTA data processing” take hours and not finish?

It indicates a stuck update stage. Users reported waiting “a few hours” without progress. Regain control via Recovery or Safe Mode, then complete the system update. [Elektroda, PawelGl, post #17203829]

Does re-downloading firmware help with this issue?

Yes. Download the correct firmware again and update. A clean package can resolve incomplete or corrupted updates behind the COTA loop. Verify model and region before flashing. [Elektroda, nutergsm, post #17206639]

Is PC flashing for Desire 12 supported, or do I need SD-card/OTA?

PC flashing options for this model are limited. One user noted no usable software to upload from a PC. Prefer SD‑card or OTA methods until a verified PC toolset appears. [Elektroda, gumstg, post #17587469]
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