[Help] X10 doesn't boot. - XPERIA X10 General

my x10 suddenly switched off and whenever i tried to power it on , only a vibration and green led flashes continuously like notification, nothing showed up in screen.
when i attach my phone without bringing it "flashmode" to pc via usb Flashtool shows that its in flash mode and after 2 sec it says "device disconnected", this thing continues until i disconnects my phone.
bootloader:- unlocked.
rom:- rooted stock GB.
Please help me.

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If it's connected to PC when I try to boot, after the ASUS screen at the start, a USB logo with a white bar shows up and stays there. Afer some time, the bar turns red.
If I try to boot without PC connected to it, the USB logo and white bar flash, the white bar turns red, and my phone switches off. When I try to charge my phone, it shows the battery for a second, then the USB, then it switches off.
Right now my device is rooted and has fastboot working.
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Okay, I saved it by flashing stock kitkat firmware using adb sideload.

Can't Boot My LG G2

I can't boot my LG G2 since I attempted to install Cyanogenmod 13 to it. It is not a "Security Error" that I can fix by flashing to stock rom. When I press and hold the power button it usually shows nothing, but sometimes it shows the logo for half of a second and goes black. I can't acces download mode or recovery, and when I tried to connect it to my pc, it opened dozens of driver(like C:\, D:\) errors, so I plugged it out and all of them gave error by saying can't open, parameter error, format the disk etc. I really need urgent help!
By the way I had downloaded opengapps and cyanogen mod 13 when I was able to access twrp.
I should add this: it continues working there is a shining black screen all the time. If I try booting it when it is out of charge, would it work?
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I am having a strange issue in my a6020a46(k5 plus). The first time i installed pixel rom from xda) the system booted up fine then after using for few hours i installed bean Gapps(mini version) but play store was unstable. It was never able to sign me up so i again fully removed everything for clean installation (dalvik/cache,data,system,cache). After installing OS i installed wifi+kernel fix and again bean Gapps which strangely didnt got installed unlike first time. Then problem began. When i rebooted it got struck into bootloop. I waited for 1 hrs but nothing happened. Then phone was not even going into recovery no matter what key combination i tried. It only got struck in penguine icon which kept restarting again and again. After many many attemps I was able to get it into recovery mode by pressing vol+,- and power button after immediately pluging it into charger. I again tried to install pixel but same problem occured. Then I tried installing other ROMs and it boots up but same pengiune icon is present there. I am not able to get rid of that icon nor able to boot up my phone with pixel OS. One more strange thing is happening and that is when phone is completely off and plugged into PC there is sound that notifies that ext device is connected and penguine icon comes in screen but when i power on my mobile then disconnecting sound comes and it never connects again untill i completely turn off my mobile and plug in USB. So summerising it here-
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Hello everyone,
It's the second time I have a problem with my LG Spirit but now I seem unable to do anything
About month ago my LG was getting stuck on LG loading animation but then I managed to flash it via Download Mode and LG Flash Tool. Everything went fine and the phone was operational till today.
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While plugged in it constantly shows the error message and reboots again and again.
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