[UPDATE]HELP - Screen flashing, phone not booting - Xiaomi Mi 5X Questions & Answers

My Mi 5x isn't booting and when it's not plugged in the notif. LED blinks but if I plug it in the whole screen starts flashing on and off. This happened after I flashed a ROM using MiFlash and I don't know what could have possibly caused (except that I flashed a Stock MIUI tiffany rom on an (i think) oxygen bootloader) help...
UPDATE
Now when I try to boot with Pwr or Pwr + Vol Up, the phone shows a black screen at full brightness and after about a minute it switches to a brightness so low that you can only distinguish that it's on by squishing the display and looking for white spots around your finger(still black screen tho) and stays like that until the battery dies.
The same happens for Pwr + Vol Dn except that the low brightness black screen stays for about 5 minutes and then it reboots as if it was trying to boot with Pwr or Pwr + Vol Up.
If I plug it in for charging it boots like with Pwr + Vol Dn except that the low brightness black screen is now completely off, stays for just a couple seconds and after that - the notification LED turns on. If I click the power button I get a battery on screen just as if it was charging and nothing is wrong.
Still haven't found a fix for this...

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Hi Guy
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hope someone could help or write down what you suppose happen to the phone ,thanks you guy so much.
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What I try:
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