STEP 1: BACKUP YOUR DEVICE
Back up important data and stuff before you start playing around here as there are chances you might lose your apps and app-data (app settings, game progress, etc.), and in rare case, files on the internal memory, too.
For help on Backup and Restore, check out our exclusive page on that linked right below.
STEP 2: INSTALL CWM/TWRP RECOVERY
Skip this step if you already have CWM or TWRP recovery installed on your device.
Make sure that you’ve latest version of the recovery installed on your device.
STEP 3: INSTALLATION INSTRUCTIONS
DOWNLOADS
Download the file given below and transfer it to a separate folder on your phone and remember the location.
ROM FILE
DOWNLOAD LINK | File name: l_developer_preview_m7_alpha_1.zip (418.1 MB)
For latest version of the ROM file, check the original page →
Be sure to transfer the ROM file you downloaded above to your phone and remember the location of the file.
You will need to flash it now on your device using either of ClockworkMod (CWM) or TWRP recovery.
We’ve got separate guide for CWM and TWRP recovery, so use the guide relevant to the recovery you have installed on your device.
GUIDE FOR FLASHING ROM IN CWM RECOVERY
Example video: If you haven’t used CWM recovery before to install a .zip file of a ROM or anything else, then we suggest you first watch a video of that to get familiar with the process. Click here to watch the video
- Boot into recovery mode. If you’re rooted, the easiest way to boot into recovery mode would be using theQuickBoot app. If not rooted, then follow the instructions below:
- Disable Fastboot on your HTC One. Go to your device’s Settings » select Battery » and Uncheck the Fastboot option at the bottom.
- Power off your device and wait for 5-10 seconds until the device is fully switched off.
- Press and hold Volume Down button, then press the Power button to switch on your phone and release it, but keep holding the Volume Down button.
└ This will boot your HTC One into bootloader mode - You’ll see a screen with option to boot into Recovery mode among several other options. Here, press Volume down once to navigate to RECOVERY, then press Power button to select it and boot into Recovery mode.
└ In Recovery mode, use Volume buttons to navigate Up and Down between options and use Power button to select an option.
For more help, head on over here → How to boot into HTC One Recovery Mode.
- Create a Nandroid Backup from recovery. It’s optional but very important to do, so that in case something goes wrong you can restore to current status easily. For making a Nandroid Backup, go toBackup And Restore » Backup.
- Perform a full clean-up of the device (This will delete all apps and their settings and game progress). For this:
- Select Wipe data/Factory reset, then select Yes on the next screen to confirm factory reset (screenshot).
- Select Wipe Cache Partition, then select Yes on the next screen to confirm wiping cache.
- Install the ROM file:
- Select Install zip » Choose zip from sdcard (or external sdcard, you know where your files are) » browse to the location where you saved the file and select the ROM file.
- Select Install zip » Choose zip from sdcard (or external sdcard, you know where your files are) » browse to the location where you saved the file and select the ROM file.
- Reboot your device. For this, go back to the main menu of recovery and select reboot system now.
That’s all. Your phone will now reboot and it will take some time as it’ll be phone’s first boot after installing Android 4.4, be extremely excited for this!
Note: In case your device gets bootloop (stuck at logo while rebooting), just do a factory reset (step 3) and you will be fine.
GUIDE FOR TWRP RECOVERY USERS
- Boot into recovery mode. If you’re rooted, the easiest way to boot into recovery mode would be using theQuickBoot app. If not rooted, then follow the instructions below:
- Disable Fastboot on your HTC One. Go to your device’s Settings » select Battery » and Uncheck the Fastboot option at the bottom.
- Power off your device and wait for 5-10 seconds until the device is fully switched off.
- Press and hold Volume Down button, then press the Power button to switch on your phone and release it, but keep holding the Volume Down button.
└ This will boot your HTC One into bootloader mode - You’ll see a screen with option to boot into Recovery mode among several other options. Here, press Volume down once to navigate to RECOVERY, then press Power button to select it and boot into Recovery mode.
└ In Recovery mode, use Volume buttons to navigate Up and Down between options and use Power button to select an option.
For more help, head on over here → How to boot into HTC One Recovery Mode.
- Create a Nandroid Backup from recovery. It’s optional but very important to do, so that in case something goes wrong you can restore to current status easily. For making a Nandroid Backup, go to Backup » and select all check boxes and swipe on the Swipe to confirm option at the bottom of the screen to confirm backup.
- Perform a Factory Reset (this will delete all apps and their settings and game progress). For this:
- Tap on Wipe » then at the bottom of the screen do a Swipe on the ‘Swipe to factory reset‘ option (screenshot).
- Install the ROM file:
- Tap on Install » browse to the location where you saved the files and tap on the ROM file. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.
- Tap on Install » browse to the location where you saved the files and tap on the ROM file. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.
- Wipe cache and dalvik cache after the ROM is successfully flashed.
- Reboot your device. Go back to the main menu of recovery and tap on Reboot » then, tap on System to reboot your phone.
That’s all. Your phone will now reboot and it will take some time as it’ll be phone’s first boot after installing Android L, be extremely excited for this!
Ref: TheAndroidSoul
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