My H30-U10 doesn't turn on, just vibrates while screen is off

Hi

I was trying to unlock bootloader of my honor 3c (H30-U10) via SP Flash Tools. When I was connecting my phone without battery to PC via USB after clicking "Download" Button, the device kept vibrating and the connection got disconnected and connected every 3 seconds. The Screen was off during all of this process.

Here is my SP Flash Tool log:

Code:

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Connecting to BROM...
Scanning USB port...
Search usb, timeout set as 3600000 ms
add@/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2

add@/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0

add@/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.1

add@/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.1/tty/ttyACM0

vid is 0e8d

device vid = 0e8d

pid is 2000

device pid = 2000

com portName is: /dev/ttyACM0

Total wait time = -1467879144.000000
USB port is obtained. path name(/dev/ttyACM0), port name(/dev/ttyACM0)
USB port detected: /dev/ttyACM0
BROM connected
Downloading & Connecting to DA...
COM port is open. Trying to sync with the target...
Failed to Connect DA: S_BROM_DOWNLOAD_DA_FAIL
Disconnect!
BROM Exception! ( BROM ERROR : S_BROM_DOWNLOAD_DA_FAIL (2004)

[H/W] Fail to download DA to baseband chip's internal SRAM!
[HINT]:
1. There's an cable communication problem between FlashTool and BootROM.
2. Target might be shutdown unexpectedly or target lost power supply.
[ACTION]
1. Try again.
2. Proceed H/W checking in download cable and target side com port.
3. Monitor if power-drop occured in target side.)((ConnectDA,../../../flashtool/Conn/Connection.cpp,127))

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and this is my dmesg log:

Code:

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[ 3440.213018] usb 1-1.2: new high-speed USB device number 55 using ehci-pci
[ 3440.307101] usb 1-1.2: New USB device found, idVendor=0e8d, idProduct=2000
[ 3440.307104] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3440.307105] usb 1-1.2: Product: MT65xx Preloader
[ 3440.307106] usb 1-1.2: Manufacturer: MediaTek
[ 3440.369300] cdc_acm 1-1.2:1.1: ttyACM1: USB ACM device
[ 3443.146921] usb 1-1.2: USB disconnect, device number 55
[ 3560.113932] usb 1-1.2: new high-speed USB device number 56 using ehci-pci
[ 3560.209002] usb 1-1.2: New USB device found, idVendor=0e8d, idProduct=2000
[ 3560.209005] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3560.209007] usb 1-1.2: Product: MT65xx Preloader
[ 3560.209008] usb 1-1.2: Manufacturer: MediaTek
[ 3560.271453] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 3563.563312] usb 1-1.2: USB disconnect, device number 56.
.
.
.
[ 3589.764652] usb 1-1.2: new high-speed USB device number 62 using ehci-pci
[ 3589.859355] usb 1-1.2: New USB device found, idVendor=0e8d, idProduct=2000
[ 3589.859359] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3589.859361] usb 1-1.2: Product: MT65xx Preloader
[ 3589.859363] usb 1-1.2: Manufacturer: MediaTek
[ 3589.921646] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 3590.138898] usb 1-1.2: USB disconnect, device number 62

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I also tried this with windows with all drivers installed, but I got the exact same result.

After a bunch of tries, now my phone doesn't even turns on. When I press power button with battery inserted, It vibrates every 20 seconds and the screen is always off, too. Connecting it to computer makes the same behavior described above.

So… Is there any way to make it fix? Since I can not access to fastboot mode and SP Flash Tools is not working either?

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