HTC Desire 828 Stucked on Bootloader Screen For No Reason

[d0oruk]

I've got HTC Desire 828 Dual Sim A51BML and been using it for 5 years. I have never tried to root it or used custom rom on it. When I was updating some applications on Google Play Store, the phone suddenly shutted down and rebooted on "BOOTLOADER SCREEN". Since then, whenever i turn on my phone or charge the phone, it shows that white screen.

screenshot: https://i.hizliresim.com/8y1rqgc.jpeg

I tried to "BOOT TO DOWNLOAD MODE" and " BOOT TO RECOVERY MODE" options. However, when i choose these options, the phone vibrates and turns on and vibrates again and all I see is this white screen. Neither of them works and I cannot reach any screen else. At that point, all I want to do is unblocking, unbricking -I don't even know what it is called- the phone and flashing some kind of "TWRP" and flashing stock rom or any better custom rom.

I have done many researches to fix that problem but I could not find any solution. It feels weird to not being able to use Download or Recovery Modes. I cannot afford to buy another phone right now and need to solve the problem as soon as possible. I need your help.
Thanks

 

[belodion]

Welcome.

There may be hardware or software failure.

Can you power off using the Power button, or perhaps by holding Power and Volume Down?

 

[mustang7757]

Welcome to AC!

What happens when you choose reboot?

 

[belodion]

We can go no further unless you respond.

 

[Laura Knotek]

That's a 7 year old device, so it most likely is not worth repairing at this point. You'll need to get something newer.