Htc one m9 stuck at boot

Hello,

My phone ran out of battery a few hours ago. I charged it, but when it boots it gets stuck at the htc logo. The same thing happened to me a few months ago, but after restarting it 2 or 3 times it booted just fine. This time though, it won't get pasted it no matter how many times I reboot it. After trying all the tricks that I found on google, I resorted to do a factory reset. I should have never done that, it didn't fix anything but it did turn off usb debugging by disabling developer mode. So it essentially made sure that I can't fix it anymore. I can't do anything from my pc because my bootloader is locked and I need developer mode enabled to unlock it with fastboot. In recovery mode I get a red triangle with an exclamation mark but I can get to the options to update via sd card. For a second I thought that I found a way to reinstall the rom via the sd but of course they had to make sure that it doesn't work because the zip failed the signature authentication and the signature authentication can't be disabled with a locked bootloader.

So is there anything that I could try or has HTC made my phone so secure that I actually have to buy a new one instead of being able to fix it?

Any advise is more than welcome because right now my phone is really close to meet my friend the hammer.

Thank you

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