[Xiaomi Redmi 4X Questions & Answers] sambau5:
I have the same issue

Hey, so I have the same issue.. Redmi 4x boots into the boot screen all the time.. Bootloader is locked so I can't flash a ROM from Fastboot. I found a solution wherin I require to use a Deep Flash Cable so as to flash a stock ROM. I just ordered one and am planning to try that. Do you think that method would work as well? .... After reading your post I tried opeing up the phone... but one of the screws is so messep up it just isn't unscrewing!

So my question, is the Deep Flash Cable method legit ?

---------- Post added at 01:57 PM ---------- Previous post was at 01:47 PM ----------

Alrternate method found:

#1 To enter EDL mode (also known as Download mode) :

Make a 'Deep Flash Cable' by short-circuiting the 'Green' and the 'Black' wire inside the USB cable. I would better recommend you to buy a quality thick USB cable from a local store and tell the guy to cut open the cable and solder the green and the black wire to a small switch.

Now, power off your device and yes, make sure it's powered off. (In case the device is not getting powered off, see the images below for disconnecting and reconnecting the battery connector.)

If Windows 10 or 8/8.1, press 'Shift' key while restarting your computer. Now, go to Advanced settings - Startup Settings - Reboot, and if on Windows 7, reboot your PC and press F8 key before the Windows startup icon appears.

Now, select 'Disable Driver Signature Enforcement' from the list.

Connect the cable to your phone and pressing the switch, connect the cable to your PC. Your phone should not show as charging. Being sure that it's not charging, release the switch. You should now see your device recognized as 'Qualcomm QLoader 9008' under Device Manager. Voila ! You are on EDL mode.

Link for making your own Deep Flash cable : https://www.youtube.com/watch?v=hmdrj4uX7gY

#2 To flash official MIUI ROM :

Download the fastboot ROM for your device, and download the latest Mi Flash tool from http://api.bbs.miui.com/url/MiFlash

I would recommend downloading the fastboot ROM with a separate download manager. Internet Download Manger - Recommended (https://www.internetdownloadmanager.com/download.html)

Also install 7Zip and WinRAR from https://ninite.com/

Now, first extract the fastboot ROM file with WinRAR and then re-extract it from the extract folder with 7Zip, and shorten the file names.

Having installed Mi Flash tool along with all its drivers ( I mean the popups asking for installing driver while installing Mi Flash), run it and select 'Clean all' from the bottom-right side.

Click 'Refresh' and it should show as 'COM10' or something similar. Now, click 'Flash'. And yes, that's it.

After successful flash, disconnect it from the cable and boot it up by pressing the Power key until it vibrates and turns on.

Yeah, you DID IT :)

*Why a download manager ? I had downloaded the file with Chrome and Firefox (without even pausing it), but even after successful flash, the phone does not boots into MIUI. It gets stuck on the MI logo. However, on using a download manager, the boot successfully completes without any hassle. I have used several download manager, but only IDM downloads the file with .tar extension which always and YES, ALWAYS results in successful flash. You can try out a different method but I would recommend you to play safe as my method is FOOLPROOF.