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[Development] How to unlock the Bootloader of an Android phone via Fastboot
#1


Unlike in some other devices, you don't necessarily need to unlock the bootloader to flash a custom ROM to your Mediatek (MTK), Spreadtrum (SPD) Android phone. You don't even need bootloader (fastboot) to flash a custom recovery since Mediatek has SP Flash tool and Spreadtrum has Research / Upgrade download tool amidst several Chinese boxes. There are however certain scenarios where fastboot is the only feasible way to get a custom recovery loaded to your device from which you can then root, backup or install a custom ROM. This guide will explain how to unlock the Bootloader on a Mediatek (MTK), Spreadtrum (SPD) or Qualcomm (QLM) Android phone, an important prerequisite for flashing a custom recovery via fastboot.

Requirements


How to unlock a Mediatek, Spreadtrum or Qualcomm Android phone's Bootloader via fastboot


Follow the steps below to unlock the Bootloader of an Android device

See the video tutorial below or @ https://youtu.be/DL5NMR-n4_Q

  1. Open the adb folder


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-1.jpg]


  2. Hold Shift (on the keyboard) then right-click on a blank space in the folder > Select Open Command window here


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-2.jpg]


  3. Command prompt screen (adb) should now be open


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-3.jpg]


  4. Connect the phone to PC (via USB cord) while ON then run the command below (by "run", I mean type then press Enter
    Code:
    adb devices


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-4.jpg]


  5. If you've setup everything right, the device should get detected under List of devices attached


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-5.jpg]


  6. Run the command below to get the phone into Bootloader (fastboot)
    Code:
    adb reboot-bootloader


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-6.jpg]


  7. The phone should now boot into fastboot


    [Image: how-to-remove-bypass-frp-google-account-...-3-min.jpg]


  8. In fastboot, test detection / connection to the device using
    Code:
    fastboot devices


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-7.jpg]


  9. If fastboot is set up right, you should see its ID printed out


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-8.jpg]


  10. Now, check the phone's Bootloader status using either of the two commands below (if its locked or unlocked)
    Code:
    fastboot oem device-info
    fastboot getvar unlocked


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...hone-9.jpg]


    1. If you use the fastboot oem device-info command and the result is false then your bootloader is locked but if the result is true then the bootloader is unlocked


      [Image: Hovatek-How-to-unlock-the-Bootloader-of-...one-14.jpg]


    2. If you use the fastboot getvar unlocked command and the result is no then your bootloader is locked but if the result is yes then the bootloader is unlocked


      [Image: Hovatek-How-to-unlock-the-Bootloader-of-...one-12.jpg]


  11. If you've confirmed your bootloader is locked, then run the command below to unlock Bootloader
    Code:
    fastboot oem unlock

  12. If that doesn't work then try either of the two commands below
    Code:
    fastboot oem unlock-go
    fastboot flashing unlock
    fastboot flash unlocking


    [Image: Hovatek-How-to-unlock-the-Bootloader-of-...one-13.jpg]


  13. Note that some devices require you to also run

    Code:
    fastboot flashing unlock_critical

  14. You should get a prompt (on the phone) asking you to press Volume up to  confirm or Volume down to cancel. Press Volume up on the phone (for some phones its actually the opposite; Volume down would confirm while up would cancel or do nothing)

  15. Once Bootloader is unlocked, reboot the phone using
    Code:
    fastboot reboot

  16. The phone might take a while to boot up (since its a first boot) so be patient


Important Notice
  • This guide isn't guaranteed to work on all (Mediatek, Spreadtrum, Qualcomm, Exynos, Hisilicon, Intel etc) Android phones
  • Ensure to backup your important stuff because unlocking your Bootloader wipes your phone's data (/userdata)
  • Unlocking the bootloader bricks some devices so ensure to relock or flash the firmware if you find yourself in such a situation
  • If you successfully installed ADB / fastboot and your device still isn't detect then its most likely due to old ADB, fix it using the guide here

Note!
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Messages In This Thread
How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 26-07-2017, 02:47 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by sparleta - 06-04-2018, 03:58 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by freshtyt - 06-04-2018, 10:27 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by slichy - 21-04-2018, 10:49 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 23-04-2018, 09:28 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hellera - 20-03-2021, 04:00 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by paeffiong - 24-04-2018, 09:10 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by arip jumaing - 17-06-2018, 04:38 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Muhanad Samaty - 03-07-2018, 04:36 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 03-07-2018, 10:31 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by belinda1093 - 09-07-2018, 09:42 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 10-07-2018, 11:16 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Dafi11 - 24-08-2018, 02:52 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by xerxes - 24-08-2018, 03:59 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by freshtyt - 24-08-2018, 04:34 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Dafi11 - 24-08-2018, 07:37 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by maxpayne - 24-08-2018, 08:57 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Dafi11 - 25-08-2018, 01:33 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 25-08-2018, 08:45 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Falkentyne - 16-09-2018, 08:06 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 17-09-2018, 04:50 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Falkentyne - 17-09-2018, 04:59 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by ismail tabl - 22-04-2019, 10:22 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 23-04-2019, 09:22 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by angelmic - 01-06-2019, 08:23 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 02-06-2019, 09:41 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by awed730 - 16-09-2020, 12:26 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by hovatek - 16-09-2020, 12:11 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by stick420 - 18-11-2020, 05:12 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 19-11-2020, 12:52 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 21-03-2021, 02:32 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by suji - 10-05-2021, 03:35 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by maxpayne - 10-05-2021, 06:00 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by suji - 10-05-2021, 06:54 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 10-05-2021, 12:46 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by jijay - 15-05-2021, 11:48 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 17-05-2021, 12:55 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by nyyra - 10-09-2021, 08:09 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 11-09-2021, 11:45 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by Trunks614 - 29-09-2021, 09:56 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 30-09-2021, 10:12 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by javelinv12 - 04-10-2021, 10:37 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by suji - 15-10-2021, 06:18 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by X3non - 05-10-2021, 11:28 AM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by javelinv12 - 06-10-2021, 04:29 PM
RE: How to unlock the Bootloader of an Android phone via Fastboot - by maxpayne - 30-12-2021, 09:18 AM

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