[One (M8) Q&A, Help & Troubleshooting] BerndM14:
Like he said as soon as you unlock you CAN and most likely did void the warranty, HTC gives a clear warning of that during the actual unlocking procedure. Anything else you do after that, flashing a custom recovery, rooting, flashing roms, deleting system apps(bloatware) etc can all really be considered "voiding" the warranty, as it's tampering with the device.

That is where having S-OFF comes in handy as you can not just easily undo all of that but even undo the tampered flags that came as a result of you messing around with the device. You can make it seem like you never even unlocked the bootloader in the first place. Though HTC itself WILL of course know that you did... That being said, It really shouldn't be a problem if you need warranty fix/exchange for hardware related issues that did NOT come about as a result of any software "modifications" / "hacking".

So get S-OFF!!! :victory: :p

Flashing the International version:

Head over to the Collection of Stock Backup's thread grab one of the 1.54.401.5 versions as we'll use the OTA update that you'll get afterwards as a test to make sure all is running good and that you can get OTA updates and install them to 1.54.401.10 . While you're in the thread also grab the stock recovery for 1.54.401.5 it's also in the first post in that thread. Put these files on your phone in the correct folder path. If you're using internal SD card it should be in /sdcard/TWRP/Backups/SERIAL_NUMBER/ <<<replace serial_number with the serial number for your device, you can find that on the box that the phone came in of course. For external sd card. /sdcard2/TWRP/Backups/SERIAL_NUMBER <<<Again same as already mentioned.

Make sure about your MID, it should be 0P6B10000 though it is my understanding that all European models have the same MID. You can check this by hooking up phone to pc and using fastboot(Method I'll show below if you don't know how). Once in fastboot type fastboot getvar mid . Next you need to change that CID to HTC__001 for international variant. You can do this by connecting your phone to your pc and opening a command prompt in the adb folder(Assuming of course you have adb/fastboot on your computer? ) you can then proceed to type these commands.

First make sure USB-Debugging is enabled on your device. Settings > About > Software Information > More > Tap 7 times on Build number. This will enable Developer options, go back to Settings and scroll down, just above "About" you'll see Developer Options, tap on that scroll down and make sure the box next to USB debugging is checked. Then go back to Settings scroll down to "Power" select it, scroll down to bottom and "un-check" the "Fast boot" box.

adb devices - [B][I]this is to see if your phone gets picked up through adb, should show you your serial number.[/I][/B]

adb reboot bootloader
fastboot devices - [I][B]again just to make sure it's connected.[/B][/I]
fastboot oem writecid HTC__001
fastboot reboot-bootloader - [B][I]make sure the CID changed correctly to HTC__001[/I][/B]

fastboot flash recovery recovery_name.img - [B][I]recovery_name being the name of the stock recovery you downloaded. Make sure it's placed in the adb folder![/I][/B]

fastboot erase cache

fastboot boot name_of_custom_recovery.img - [I][B]make sure you BOOT the recovery for the same backup nandroid you chose. If you downloaded a TWRP backup then BOOT TWRP, if you downloaded Philz Touch nandroid then BOOT Philz Touch. Again, make sure this file is in adb folder UNZIPPED if it's zipped, same with the stock recovery, if you downloaded it zipped, unzip it and place the .img file in the adb folder. So let's assume you went with TWRP then it'll be:[/B][/I]

fastboot boot openrecovery-twrp-2.7.1.0-m8.img

Once it booted the custom recovery wipe the dalvik-cache, cache and data partitions. Then do a restore from the path to the nandroid backup. Reboot the phone and you're set, it'll take a while on first boot as it loads up all the things. Once it's booted you should also get a pop up for the new OTA 1.54.401.10 go ahead and accept it and see if installs properly for you, if it installed properly and updated your system then...

Congratulations you're now an International WWE user. :good:

You'll also have the extreme power saving mode you so desperately seek and desire.