[big44]

Is there any way to install  a custom rom for this device or any way to get rid of the adverts on the charging screen? 

Thanks

[hovatek]

Is there any way to install  a custom rom for this device or any way to get rid of the adverts on the charging screen? 

Thanks

Its either your launcher or one of the preinstalled apps on the phone.
You would need to root the phone to be able to remove the culprit