This is the official page from which you can Download HTC U11 Stock Firmware ROM (flash file) package on your Computer.
The firmware package comes as a compressed file (zip file) which contains Flash File, Flash Tool, USB Driver and How-to Flash Manual.
HTC U11 Stock Firmware ROM (flash file)
The HTC Stock ROM will help you to downgrade or update your HTC Device. It also helps you to fix the device if it is having any Software related issue, Bootloop issue, IMEI related issue or facing WiFi related issue.
Package Name: HTC_U11_RUU_OCEAN_WHL_O80_SENSE90GP_MR_NA_Gen_Unlock_2.42.617.7_EXE.zip
Package Size: 2 GB
How-to Flash: Open and exe file from firmware folder and follow the screen instructions.
How to Flash HTC U11 Stock ROM
Step 1: Download and upzip the firmware on your computer.
Step 2: After unzipping the Firmware package, you will get the Firmware (ROM), Flash Tool and Driver.
Step 3: Install the provided USB Driver on your computer.
Step 4: Open the Firmware Folder and launch the .exe file.
Step 5: Connect your HTC U11 device to the computer.
Step 6: Click on the Next button to begin the Flashing process.
Step 7: Once flashing is done, disconnect the device from the computer and restart it.
[*] HTC Driver: If you want to download the latest version of HTC USB Driver, then head over to the HTC USB Driver Download Page.
[*] Take a Backup: Flashing the above Firmware will delete the personal data from the device and you wont be able to recover it in anyway. Therefore, we recommend you to take a backup of the personal data before flashing the above firmware.