HTC 510 keeps restarting and no GSM Signal - HTC Desire 510

Hello,
I have HTC 510 and suddenly started to restart by it self. It is the original software and when is on I can see no GSM signal basically cross sign indicating no signal. I tried then to do factory reset but it showed locked/tempered message. Then I unlocked the boot loader from HTCDev. Tried to do factory reset after that however it restarts the phone and then enter again in the loop of restarting so basically factory reset did not do anything.
Could you please advise what else can be done?
Thanks,

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Stuck at HTC logo

Today I flashed my device to L26 KaiserDiamond from a WM6.1 Dutty's ROM.
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Have you tried to re-flash it?
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HTC One locked/can't boot? please help :(

hi there, I have a new HTC One on AT&T. I tried to do a soft reset, and since then now it will load with the Quietly Brilliant screen, but after that the screen is blank. It won't do anything. I tried to do a factory reset and it still does the same thing. I did notice on the bootloader screen it says my device is locked? I tried connecting it to my macbook and the HTC Sync manager says my device is locked and it is unable to recognize it, please unlock it and reconnect.
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darkenedaura said:
hi there, I have a new HTC One on AT&T. I tried to do a soft reset, and since then now it will load with the Quietly Brilliant screen, but after that the screen is blank. It won't do anything. I tried to do a factory reset and it still does the same thing. I did notice on the bootloader screen it says my device is locked? I tried connecting it to my macbook and the HTC Sync manager says my device is locked and it is unable to recognize it, please unlock it and reconnect.
I can get into HBOOT but nothing from there seems to lead me to anything but the blank screen again (from which I can hard reset or go to the HBOOT)
I'm at a complete loss as to what I should do, please help!
Click to expand...
Click to collapse
You can unlock the boot loader, and flash a custom rom
MacHackz said:
You can unlock the boot loader, and flash a custom rom
Click to expand...
Click to collapse
How do I unlock the boot loader?

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