How can I install official rom on a android which is showing "No command"?

[AC Question]

Hi. I'm using Lenovo A2010. a few days ago , I was updating my phone. as usually , in the process of updating I left it in table & went away. few minutes later I returned & saw there's a android logo saying "No command". I got frightened. I took it to the normal (default) recovery mode. Then I wiped up the phone. I mean , I made a reset. Now , whenever I turn on the phone , it says "No command" along with prompting a laid android logo. I don't know what to do. Please help me out! I'm greatly in need of my phone.

 

[Rukbat]

Bring it to your carrier, tell them that the update seems to have failed, and ask if they can reflash the update. (Although "no command" can also mean a hardware failure.)