phone won't boot, led blinking fast - Xiaomi Redmi Note 5 / 5 Plus Questions & Answers

Hi,
My phone turned off.
I don't think my battery was empty, but can't be sure.
When I plugged it to recharge, the led was blinking fast, and the big battery icon didn't show up.
I never could turn back my phone on.
I've read here and there that it could be a battery issue.
I've opened the phone, unplugged the battery and connected the phone to my pc. It turns on, but bootloops every 3-4 seconds (Mi logo shows up, then it vibrates and reboots).
I tried plugging the battery back with the Mi logo on, but then the led starts blinking and the phones stops looping (turned off).
I managed to boot into fastboot by holding the - button and plugging the usb. Running adb devices doesn't show anything. Yet there is no error when trying to flash twrp through adb.
I managed to boot into twrp (so it was actually flashed, because I had orangefox recovery before the crash.
Yet in twrp, the note 5 plus folder is empty. I tried to mount usb, nothing too.
I tried to backup via adb twrp, and I got a bunch of errors ("unable to mount data", "unable to mount storage", ... then a bunch of "e:recv error on uevent").
Any idea what I can do ?
Is it the battery ? Don't really want to buy a new battery if i't not sure it's the problem.
I had to buy a new phone in the meantime, so I mainly want here to recover data (pictures mostly) from my phone.
Thanks !

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This morning, I saw the screen was on, but black.
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Turned the phone on... the LG logo screen appears, after around 3-4 seconds, it's some kind of blink(0.5-1 seconds) and the LG logo appears again. After another 2-3 seconds, some kind of battery appears that is charging on the screen and then the phone turns off. Tried 2-3 times and same thing. (Note: Phone wasn't charging! The charger was removed)
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Charging the phone without battery(reboots again and again)
Pulled out the sd card and pulled in again.
Tried to boot into recovery but no success.
When connecting to PC, the phone is detected, but detection dissapears when phone closes(explained above)
> If you already tried all of those, then recover using kdz updater, flash the stock rom, root back, and flash recovery again.. well.. lets wait for more replies might help you out.
what phone mode should I select?
CS_emergency, diag or Emergency?
My phone screen is right now black(it's turned off but screen is black)
Edit 1: betashot.net/50hZELt.png < open in webbrowser , it's an image.
Edit 2: I managed to boot into recovery mode, cleared cache, dalvik cache and battery stats and now it seems it's working...
> thats goOd to hear now.
Sent from my little fingers.. to your face using XDA app
This is one old problem. Whenever it happens.. just boot into recovery and REBOOT from there!!
This is happening to me and I can boot by getting into recovery, however I need to sell my phone and worried it will be classed as faulty,any idea how to fix properly.
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[Q] Vodafone Smart II probably bricked

Hello i have recently updated my ROM but sadly something happened with my service, it just said "no service" and i wasn't able to receive or take any calls so i installed this rom again from the recovery, and then when i rebooted this device, it suddenly stopped on the green goblin logo loading screen and my device was unrecognized by a PC, recovery didn't work... so i tried a RoFUSiON which can install a rom through the pc but my device, as i said, wasn't and isn't recognized anymore. What i can do? i can't even charge it, last night i connected it to the charger and let it on. When i woke up and unplugged it, it had no battery! probably it wasn't chargning, it was discharging, and the only way i can turn my mobile on, is plugging it to the usb, doesn't matter if into the power socket or usb-to-usb, even the screen lights up without the battery but still i can't go to the recovery or fastboot (probably, because as i said my device isn't recognized so either that's the problem either fastboot doesn't work). Here's also the video about this, maybe someone can help me since i don't know what to do.. thanks in advance.
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[Q] Lenovo phone bricked itself?

Hi,
I've got Lenovo s650, rooted with a custom rom (MIUI). All was perfect for weeks but few days ago it started randomly going off. Then I noticed that sometimes when I listen to music it crashes (making the music freeze and repeat same note for like 10secs) and shuts down. I thought it could be related to some apps but since I was very busy I didn't do anything about it.
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Some additional info:
I've got TWRP recovery (however I am unable to re-download it again via flashtool because of DRAM error).
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Not having a phone I'll probably give a "Format all" option a shot in flash tool... either gonna brick it forever or fix it..
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