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Original issue. My cousin plugged in his HTC M9; he said it showed a count down from 5 to 1 then shut off. To which he discovered that the charging port had visible signs of burning and smelled as such.

I replaced the charging port ribbon cable and was able to immediately start charging the phone. However it wouldn't boot up normally. It would boot directly to the bootloader and I could transfer from there to download mode but not into recovery to wipe cache partition. I could also issue fastboot commands via ADB. (still virtually useless)

I tried to flash stock recovery but didn't have enough battery level on phone so had to wait. I plugged back into wall outlet to improve charge time.

Once it reached 32% I transferred usb cable back to computer when phone instantly went blank and showed no signs of power remained. No count down; no signs of internal damage to any area. I didn't take the phone apart further than the case to check ribbons etc.

I thought maybe display just went out:

    fastboot devices  

nothing listed.

I tried vol up+pwr button to force cycle the power only to receive audible prompt from computer that usb device was connected but no connected device shown.
I held all the buttons for more than 5 minutes while connected to computer only to receive audio prompt every so often without any visible results from phone or computer.

Device manager shows: Qualcomm HS-USB QDLoader 9008 (COM9)
Computer management: Doesn't Shows any connected USB storage devices..

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  • @S. Mitchell What are you​ talking about?!?
    – esQmo_
    Apr 5, 2017 at 23:01
  • @Wayne what does the Device Manager show when you plug the phone to the computer?
    – esQmo_
    Apr 5, 2017 at 23:02
  • Try the battery reset logic explained here and here - could be faulty calibration
    – beeshyams
    Apr 6, 2017 at 2:03
  • Device manager shows: Qualcomm HS-USB QDLoader 9008 (COM9) ..... Battery reset logic did nothing
    – wayne
    Apr 7, 2017 at 22:06

1 Answer 1

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you can charge the battery outside using universal battery chargers . if the green screen is there you can flash original firmware back. if no green screen there you hawe to install boot-loader/some kind of BIOS, to chip. its in general device specific.so there comes the word bricked we can call for the device since we will need specific firmware . :D but actually its wiped device that can be restored only by original software and sometimes some specific devices programs designed to install is needed.

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  • Unibody design makes the battery charging outside the phone a mood point. I wouldn't even know what to purchase to make that an option. Given the lack of function. I haven't been able to diag it properly. the screen hasn't lit up in any way since I last plugged into computer.
    – wayne
    Apr 10, 2017 at 10:27

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