- Lumia 630
- Lumia 635
- Lumia 636
- Lumia 730
- Lumia 830
However there are some restrictions, one of them is that you'll need to have one of the currently supported device(s). Besides being in the support list, you'll also need to take extra care as this is still an unfinished build and like on the desktop side, bugs are expected and Microsoft has compiled a list of known issues for this first build. Microsoft does not recommend you to install this on your main phone as it might not be suitable for day to day use and the terms does note that this will indeed void your warranty. But if you do insist on trying this on your phone this weekend you can try installing it and getting back WP8.1 before the weekend ends, Microsoft is providing a recovery tool to restore back to WP8.1
- Supported device
- Stable Wi-Fi connection
- 700mb of free internal storage
- At least 40% of charge (best if fully charged)
- 60 minutes of time to spare (approximately)
Step 1: Backup your dataThis is probably the single most important thing you'll need to get done before installing the Windows 10 for phones technical preview. Thankfully, the process is quite easy and you don't even need a computer to backup your phone (a stable wi-fi connections is all you need). The only option to do so is through OneDrive, head over to the settings > backup and turn on the backup for your 'Apps + settings', 'Email + messages', and also 'Photos + videos'. This shouldn't take too long but it does depends on the amount of apps and media you have on your phone.
Step 2: Download the Windows Insider appwww.insider.windows.com and sign in using your Microsoft account.
After installing the Windows Insider app, jump into the app and choose either Slow or Fast (currently only the Fast option will give you the Windows 10 TP update). Then you'll be asked to accept the terms of service, after accepting that your phone will reboot.
Step 3: Clear space to download the update (optional)Besides backing up your device, you'll also need to clear up your internal storage only if you do not have 800mb of free internal storage (downloading the update onto the microSD card is currently not supported). There are two way you can do this, one is to move your apps/videos onto your SD card and the other option is to uninstall apps and deleting your photos/videos.
To clear up your storage, you can do it inside the Storage Sense app. Just click on phone > apps+games or phone > photos to start moving or deleting your apps and photos.