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Nexus 5 us Stuck in Bootloop - Nothing Works and cant unlock The Phone.

Hi all,
I have a Nexus 5 that I bought second hand. It powers up but is stuck in a bootloop. The Google Logo appears and it starts to load but it does not progress. I can get in to boot loader and I have tried to do a factory reset but it it still stays in the boot loop. I have tried to install the new factory software using the Nexus Root Toolkit but nothing. The Phone is also locked and I cant unlock the phone so the Nexus Root Toolkit wont allow me to try to flash the stock image? I am at the end of my knowledge base as I have tried almost all the normal methods to unbrick and fix the boot loop. The Phone can access the boot loader. When I try to unlock the phone using the Nexus Root Toolkit, it unlocks it but does not write the data and it becomes unresponsive! I have no idea if USB developer is on in settings as I have never got in to the Android operating system as I cant get past the bootloop.
Your help and suggestions would be most helpful as I am now at an end of my abilities until I am further educated about how to resolve the issue.
Res

I haven't tried this myself (no need), but since you seem to have nothing to lose give it a go. It's official Google, and comes with instructions.
https://developers.google.com/android/nexus/ota#instructions

Does the fastboot oem unlock command work?

Do you have all the correct usb and adb drivers installed??
First off, I suggest doing some reading up on adb and fastboot. Then manually flash factory images first and try to boot the phone completely.
The links @dahawthorne will help a lot.
Then try the command that @audit13 mentioned.

[Completed] Can anyone help me please!!!!!!!!!!

I have a Galaxy S5 on Straight Talk, (SM-S902L) rooted with TWRP recovery and still on stock rom. I made a DUMB-ASS mistake and would like to know if it could be corrected. I installed the TWRP Manager app from Google Play and tried to boot into recovery through the app and all I get is "Custom binary blocked by Reactivation Lock, Secure Fail: Recovery". I know that I should have disabbled the Reactivation Lock like I did whem I rooted the phone but I didn't think about it untill it was to late. Because I used the TWRP Manger app, every time the phone boots it tries to boot into recovery so it's stuck in a boot-loop I think. If anyone has an idea that may fix my problem PLEASE share it with me, I'm still kinda a newbie at all this. Thanks

Well ,
Just re install stock firmware through odin , then everything's will be ok
Good luck ,,

S6 can't boot recovery or recovery. In bootloop. Has Reactivation lock on!

One day, my phone just suddenly froze. Gave it a day to be left alone and it probably ran out of battery. Upon charging and trying to turn it on, it gets in a bootloop. It is NOT even getting past the very first logo at the start. It just shows "Samsung Galaxy S6 Powered by android" then freezes there.
I boot it into download mode and was unable to flash ROMs, Recoveries or Kernels. It has Reactivation Lock on!
"Custom Binary blocked by RL"
I gave up after this, but then I came back after months. I want to see if I can bring this phone back to life again. I've recently found this video where it has Odin 3.11 that had an option to disable Reactivation Lock!
https://www.youtube.com/watch?v=nt3VM3nd02U
I tried flashing TWRP and SpaceX kernel and it worked! It said pass, I saw the download bar in my phone fly across to completion and it did not show Custom Binary blocked by R/L again! Okay so... What now? It's stuck at the very same boot logo freeze. I STILL can't boot into TWRP recovery. I cant do anything. Is it HardBricked? Is it something to do with my EFS or Partition or whatever? Please help.

B U M P

FRP lock = In between a rock and another rock

My phone began lagging last night so I gave it a restart. The shut-down animations were normal but when the phone turned back on, it gave me the dreaded FRP LOCK curse. I went through many forums and videos and I was able to take the lock off via FRP Hijacker, but now I am stuck at the download mode. If I try booting the phone on with the stock recovery, the Samsung Note5 splash screen stays indefinetly (soft brick). If I try booting the phone with a custom recovery, I get a message in purple text saying "Recovery image signature check fail. Reboot to avoid Warranty bit set" and it will keep bootlooping. Currently, I am not sure how to continue if I cannot get to the recovery mode and flash a ROM. So basically, I am stuck at not being able to flash a rom, nor being able to get into recovery mode successfully without a brick or bootloop. Any help is greatly appreciated.
Edit 1: USB Debugging is turned on as well as OEM Unlock

you need to use odin and downgrade to a stock 6.0 tar file..or use a conversion tar file taking you from n920p to n920f..or n920c ...ill upload the files everyone needs after work today...

[HELP] I think I broke the phone and cant seem to be able to fix it

Okay so I have a samsung galaxy a03s and I wanted to root it but it would appear that's not easy. So I then try to install lineage because that's rooted, but that's not very easy either so I try flash twrp because I think you need that first, and somewhere in between all that I seem to have broken the phone. I get the "error while updating system software" error, I try to fix it with smartswitch and it says this device is not compatible or something and won't fix it. I try Oden and I get the "sw rev check fail vbmeta fused 4 binary 2 rp check error vbmeta". Honestly idk what I did to it but I need help fixing it so if you could help me that would be awesome! Thanks.

Okay so update. I was able to flash the phone with Oden but now the phone just keeps boot looping, where it just turns on and the samsung logo flashes then turns back off, then it keeps doing it over and over.

Final update: I left it boot looping for a bit and then it said samsung.. then it said erasing. It restarted and booted. I think I finally fixed it almost a year later.

Wondering why you started this thread?