[Android Q&A, Help & Troubleshooting] Matty1993:
Hi everyone I run my own phone repair shop i had a Customer bring a HTC u11 2PZC1000 in to repair was soft bricked with an attempted custom rom installation, then re lock of bootloader without flashing a system to it

The os version was still there however when the device booted a message appeared the device is corrupt cannot be trusted and will not boot,

Devixe specs were,

Fastboot oem readmid

2PZC10000

Fastboot oem readcid

htc_039

hTc download mode

***relocked***

***production***

htc_ocnuhl PVT S-ON

LK-1.0.0.0000

Radio-8998-002772TOV-1712061121

OpenDSP-V11.6.00347.CB8998_0711

OS-2.33.710.9

Dec 8 2017,21:29:54 (1002308)

Bootloader displayed killswitch enabled on the 3 options when trying to unlock with provided original unlock_code.bin that was provided on with the phone & returns not allowed on production build in bootloader, could not flash any stock recoveries or TWRP back to the device,

I used htc_fastboot with the htc_fastboot command syntax, then used minimal adb and fastboot 1.7msi & also power shell im using windows 8.1 couldn't get anything to flash to the customers phone i downloaded the OTA's & firmware from the google spreadsheet it had no file for the 2.33.710.9 section there the page it went to was 404 so I just downloaded all of the files with the same CID htc_039 in this case but still to no avail, one day however I stumbled upon the fix,

What i found that actually worked to repair the device was,

#1 went through the files in spreadsheet then downloaded all with the same CID as mine even though the main versions were different,

#2 tried to flash them all to see what was a signed or close to signed zip and what was garbage that needed to be deleted, (you will know by the RUU errors you face anything but RUU security fail zip from USB command ) means it probably won't work but try anyway,

narrowed it down to a few but the one that did end up working was main version 1.11.710.5, but this main Verision was 2.33.710.9 ??? Dont ask me how it worked twice as it needed to be flushed first time it said but it did,

#4 now to the only tool that works and I had already had it on my PC believe it or not but its the HTC 10 batch tool which can be found amongst where the Google spreadsheet Info is found,

#5 all I did was placed the .zip into the "com" folder which is located where ever the batch tool is installed in my case was C://Android/com,

#6 opened the batch tool selected option 3 to open fastboot terminal with the purple screen,(when entered location of the terminal should be "example" C://android/com on the screen) this is where you place your RUU.zip file.

#7 booted to download mode, plugged the device into the computer made sure drivers were installed properly and working.

#8 type into the terminal "fastboot oem rebootRUU"

phone will reboot to RUU mode.

#9 type into terminal "fastboot flash zip <file_name.zip>

it flashed all 28 zips twice as it needed to be flushed the first time, so there you go this helped me and now I hope it can help you all out with your broken U11 fix.

Enjoy :)

☆NOTE☆

when using the HTC 10 batch tool fastboot terminal you can use either standard "fastboot" syntax or the "htc_fastboot" syntax both work do not add " " or < > into the command syntax simply drag and drop the file if you do not wish to type the entire filename out.

☆Standard syntax☆

fastboot oem rebootRUU

fastboot flash zip "<example.zip>"

☆htc_fastboot syntax☆

htc_fastboot oem rebootRUU

htc_fastboot flash zip "<example.zip>"