P8 Lite won't turn on after MM update - P8lite Q&A, Help & Troubleshooting

Hi there
I've just replaced the screen of my P8 lite. I booted, everything working fine in Lollipop. so i start downloading the update to 6.0 via the updater app.
it just casually installed the update, went to the screen with percentage of how far the update is at. It finished, 100% then decides to reboot and poof, only black screen, no boot up screen or all the other stuff. Just a plain Black LED Backlight.
I've tried downloading the 6.0 to 5.0 firmware on my sdcard in dload map. when i boot the phone by holding volume +, volume - and power button, it just boots back in the black screen, not starting the update.
I've also tried other firmware the site offers.
Here is some information about my device:
Huawei P8 lite ALE-L21
Which steps should i consider taking here?
thanks in advance
Update: apparently it's just some problems with the hardware of the screen, since when i press volume +,- buttons it still makes sounds, and double tap takes a photo. But isn't it still quiet strange that right when the update hits 100% it started malfunctioning?

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