I've increased the dpi in developer option and once I changed the dpi the phone screen turned black and the phone started to reboot, after each reboot it lands in recovery mode. Is there any way to take my phone out of this while preserving my data.
Is there any way to back up the data using adb sideload (MiPCSuite), or fastboot commands (or reinstall the MIUI 11.0.5.0 zip file if it helps).

My Phone runs latest MIUI 11 and usb debugging is enabled, (unfortunately oem unlocking is disabled)

Thankyou!

P.S: Changing dpi was perfectly fine in MIUI 10.

same problem with my mix mix2. accidentally changed dpi 600 to 6000. now phone stucked on bootloop, any way to revert back, somebody help me

thanks

Unlock bootloader using mi unlock tool. then flash the latest fastboot rom. Unlocking bootloader wipes internal storage also.

i want my personal files too

No u cant. If bl is locked then use a deep flash cable to flash in edl mode using mi flash tool. Downlaod lattest fastboot rom from mi website and then flash it in edl mode.

Sent from my Redmi Note 7 Pro using XDA Labs

Same thing happened to my mi mix 3... big ****ing bug

If you set up ADB on your PC before the bootloop happened, you might still be able to enter adb shell when the phone is in the boot animation phase. Try that and if so, reset the DPI from ADB.

adb shell wm density reset

That should work.

I changed my dpi from default (392) to 411 on my POCO F1, MIUI 11, nothing happened.

Do NOT change the Smallest width / DPI to an absurd number. If you do, and if you don't have ADB enabled or you don't have an unlocked bootloader, there's no way to restore the default DPI nor is there a way to reset your phone to factory defaults (unless the built-in MIUI recovery has the option to wipe data).