Huawei P Smart 2019 loudspeaker not working

Greetings,

My sister has a Huawei P Smart 2019 for about 2 years. Two months ago she told me that her loudspeaker has stopped working. I checked the phone and I saw that sound works normally when headphones are plugged in and also upper speaker works when on call with someone. I thought that there is just problem with her main speaker so I ordered a new one and waited for it to arrive. Occasionally phones main speaker would work normally but that would just be for hour or two and then couple of days being dead. It has passed a month and today I have received spare speaker for the phone. I have opened the back, carefully removed the flex cables and unscrewed the speaker. When I booted up the phone it didn’t have any sound like I did nothing. Any help maybe? Do I need to do some reset because of the new module inserted or stuff like that because I really donno what to do else.

Best regards,

Antonio