Please confirm did it work before ? And as you showing the device module only support 2G frequency ,Please confirm if the sim card can work with mobile phone 2G network .You also can give us your skype ID here , I can add you and talk with you there .
Sorry to tell you that your current device only support 2G , can not update to support 3/4G .If you want to support 3/4G frequency ,you can chose our GWM401L or GWM420L ,this link
. By the way your chassis is WGW1002, it is already end of life , So you need a new chassis for GWM401L or GWM420L .
Hope these info help you .