There's a always a chance. Just that way it 'fell of its perch' - with no poking and prodding from you, suggests physical failure, and others have also had similar experiences on these forums and tried these measures only to fail also.Ok so sad. No chance with DC unlocking tool ? A new phone is already existing. Xiaomi baby...
If you had been running OEM scripts, trying to change startup logo, or restoring oeminfo.epb from another phone, flashing anything and interrupted it or power failed mid flight, etc etc, I'd say there is a good chance emmc is simply corrupt and can be restored. If you did nothing like this my guess is it's likely your phone has physical memory damage as simple data corruption on the non-OS partitions seldom (probably never) happens with normal use.
That's why I asked if you ever noticed phone overheating. - a dead give-away re what happened (excuse the pun).
Anyway I'm not 100% sure, just going by experience (I've had charging, USB data connection and notification led failure on several Y550 phones (snapdragon 410 SOC also) due to overheating, and others had memory failure with symptoms like yours.
I haven't played with QFIL myself. If it has a memory test function (like HiSuite), I'd run diagnostics. QDLoader or other software may have test functions too.
You could try 3rd party solutions (did you mean DC Phoenix?), if you want to exhaust all options. But you may be throwing good money after bad... grasping at straws... flogging a dead horse... resuscitating a dead parrot even (- just can't help myself :laugh: ).
All best with Xiaomi baby.
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