: If the phone is stuck but doesn't need a full reflash, hold Power + Volume Up to enter Recovery Mode and select "wipe data/factory reset".

If your phone is still functional and you simply need the latest software, you do not need an external link. Go to Settings > System > System Update to pull the official firmware directly from ZTE servers. Third-Party ROM Providers (Use with Caution)

If you need a full stock ROM (Flash File) for repair purposes, official downloads are typically hosted on the ZTE Support Download Center . : ZTE Blade A55 (Z2450) Support .

Assuming your ZTE Blade A55 has a MediaTek chip and you have found a valid , follow these steps: