Schedule the startup scan of avast free antivirus on save mode

Hi, I’m trying to schedule the startup scan of avast free antivirus on my laptop from safe mode.

I’m following the steps on the official avast website which are helping me a lot. I’m already on step 3 which is to put sched /A:* in the command prompt interface, but here it fails.

The problem is that it tells me <“sched” is not recognized as an internal or external command, program or executable batch file>, I’ve also tried with sched.exe /A:* and it tells me the same thing. I don’t know what else to try to schedule the system scan at startup.

Please help and thank you very much in advance.