HELP! One mini 2 can't unlock bootloader doesn't show splash screen

Okay lots of issues hopefully one easy fix,
I have had a HOM2 given to me to fix for my friend so just want it back to stock , it has no radios it mentions invalid_ver_* , same for another option, the bootloader is LOCKED here is my getvar info

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: INVALID_VER_INFO
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 2.19.401.2
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: SH466WR01102
(bootloader) imei: 35***********
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: mem_ul
(bootloader) platform: hTCBmsm8226
(bootloader) modelid: 0P8B20000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: be7179e5
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!

, its bootlooping into bootloader, so my first thought was unlock bootloader flash recovery and side load a rom, play with radios and such after, but trying to unlock the bootloader doesn't work I've tried HTC dev twice to check the unlock code but it pushes it to the device and claims it was successful I get this;

**UNLOCK CODE***

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash unlocktoken Unlock_code.bin
sending 'unlocktoken' (0 KB)...
OKAY [ 0.109s]
writing 'unlocktoken'...
(bootloader) unlock token check successfully
OKAY [ 0.016s]
finished. total time: 0.125ss

tried different USB cables and ports but every time I try I don't get the unlock splash screen asking me to unlock, so I went through the forums and tried a few things found that clearing cache or and data gives me

**CLEAR CACHE***

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
FAILED (remote: erasing error!)
finished. total time: 5.038ss

I tried flashing recovery (just for kicks) I get

***SEND RECOVERY***

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash recovery recovery-twrp-2.8.5.0.img
sending 'recovery' (11796 KB)...
OKAY [ 10.472s]
writing 'recovery'...
(bootloader) signature checking...
FAILED (remote: signature verify fail)
finished. total time: 11.316sss
Which I guess is to be expected,

I then found an RUU for the device and was thankful the unlocking didn't work so I was still locked, but every one I try to download is corrupt? Anybody have a working link for a UK ee (orange) radios and firmware? And do I have the right idea with this, download, rename, chuck it on an sdcard and bootloader should find it automatically?
Thanks for any advice

Nexus 6 - Google splash screen boot loop after flash of 6.0 factory image (unlocked)

Hi,

I'm hoping for some suggestions regarding my boot looping Nexus 6. Here's the details:

- Brand new device.
- First boot & setup. OK.
- Unlocked bootoader. OK.
- Reboot back into 5.0. OK.
- Tried to flash 6.0, initially using flash-all.bat from shamu-mra58k-factory-5b07088c.tgz. Failed.
- Extracted zip inside shamu-mra58k-factory-5b07088c.tgz and flashed all .IMG manually.
- Phone now stuck in boot loop. Google logo appears, sits there for 5-10 seconds then reboots.

I so far have tried:

- Multiple reflashes of 6.0 factory image. Boot loop remains.
- Multiple flashes of 5.1.1 factory image. Boot loop remains.
- Tried flashing Cyanogenmod cm-12.1-20151021-NIGHTLY-shamu.zip via recovery. Flash successful. Boot loop remains.
- Flashing gpt.bin and reflash 6.0 images. Boot loop remains.

This is the first time I've encountered issues. I've successfully flashed factory images to my Nexus 4 many times over the
last couple of years.

Does anyone have any suggestions re a fix, if at all possible? Any tips/suggestions would be greatly appreciated!

If i need to return it, should I flash to 6.0 and lock? Will they be able to tell that the bootloader has
been unlocked previously?

Thanks!!