You'll also need a few tools, namely ClockworkMod recovery, the fastboot files you used to unlock your bootloader. Grab them here: Android Central Forum
If your device still supports official updates, these are the safest options: android 4 1 skachat proshivku
Go to Settings > About device > Software update and select Update . If an update is available, follow the prompts to download and install it over Wi-Fi. You'll also need a few tools, namely ClockworkMod
For Samsung devices, you can use tools like Samsung Kies on a computer to check for and install firmware upgrades. Manual Flashing Methods You'll also need a few tools