[Q] No OS on my HTC One :x

prerequisites:

• you need adb and fastboot on your computer, either by installing the android sdk or minimal adb and fastboot
• you need to know how to start a fastboot/adb command prompt:
  
  to open a command window prompt, in windows go to start menu --> ''run'' then type cmd. Change the directory to the adb folder on your machine:
  

  • if using the default install location for the sdk:
    
    Code:

    cd c:\android-sdk-windows\tools

  • if using the default install location of minimal adb and fastboot:
    
    Code:

    cd c:\program files (x86)\minimal adb and fastboot

  • or hold left shift + right click a blank space inside the folder where adb and fastboot are located and select ''open command window here'' from the contextual menu.
    
    
• you need twrp recovery (2.6.3.3 or higher) on your device.
  
  
  

  1. unlock bootloader if not already unlocked:
     
     
     thanks to electroz for the video tutorial
     
  2. flash twrp recovery:
     
     1. make sure the recovery.img file is in the same folder where adb and fastboot are located
     2. reboot phone in bootloader mode
     3. flash the recovery:
        
        Code:

        fastboot flash recovery name_of_recovery.img
        fastboot erase cache
        fastboot reboot-bootloader

  
  
• you need your htc drivers correctly installed on your pc:
  
  
  

  

  
  
  if not, follow this guide (thanks to nkk71):
  

  originally from @nkk71: [guide] [02-mar-2014] nkk71's superguide to returning 100% back to stock
  
  follow the below instructions to fix
  
  open "device manager" -> select the unknown "one" -> right-click -> "update driver software ..." -> "browse my computer" -> "let me pick" -> "android usb devices" -> select "my htc ..." -> install that
  

  just in case, htc drivers can be found here: [drivers] htc drivers for windows - several versions (credits to @mdmower)
  though you should already have them since you have been using your phone anyways
  
  for those who like a visual guide:
  

  
  okay so i did a fastboot boot command, and as you can see it didnt install correct driver
  

  

  
  
  
  open "device manager"
  

  

  
  
  
  there's the culprit
  

  

  
  
  
  right click and update driver software
  

  

  
  
  
  select browse my computer for driver software
  

  

  
  
  
  select let me pick from a list of device drivers on my computer
  

  

  
  
  
  select android usb devices
  

  

  
  
  
  select my htc ... (if you have more than one version, choose the latest)
  

  

  
  
  
  warning, select yes
  

  

  
  
  
  successful installation
  

  

  
  
  
  now it looks better
  

  

  
  
  and can confirm:
  

  Code:

  c:\adb3>[b]adb devices[/b]
  list of devices attached
  htxxxxxxxxxx    recovery

  Click to expand...

  Click to collapse

  ​

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  Click to collapse

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procedure:

1. make sure the rom you want to flash is in the same folder where adb and fastboot are.
   
   

   
   here is a list of the htc m7 roms
   
2. connect your phone to computer using usb cable
3. reboot phone in recovery mode (twrp):
   
   • if phone is booted in os:
     
     Code:

     adb reboot recovery

     
   • if not booted or bootlooping, hold power button + volume down until phone boot in bootloader mode
     then select bootloader then recovery using volume up/down to navigate and power button to select.
4. make sure your phone is booted in twrp main menu:
   
   
5. transfer the rom to your /sdcard folder:
   
   Code:

   adb push name_of_rom.zip /sdcard/

   
   wait for the zip file to transfer, this can take several minutes and there is no progress bar. When the command prompt give you back the hand and display how much bytes transferred in x seconds, the transfer is completed:
   

   

   
   
6. in twrp main menu, select ''install''
7. browse the installation menu and select your rom zip file inside /sdcard folder:
   
   
8. swipe to confirm you want to flash the rom
   
   
9. reboot phone

Click to expand...

Click to collapse