samsung a20 usb error weird happend

i have a problem samsung a20 wont respond my usb notebook. first i think its broken cable , then i get the new one, still wont work,  i try download driver from any source on my  fujitsu lifebook. still have the same problem, i try to reset my phone, nothing changes. i give up.... thousand year later i try android sdk download just for create android emulator nothing todo with my samsung a20. ok im using emulator for couple day. in the mood i remember my phone samsung a20 , not take to long i try to put my notbook usb cable connecting a20.... suprise suprise its work just for internet tethering. oke im quite happy but not really coz i want to connect as storage too. iwant all feature is back like before android 11. i try download stockrom and using adb sideload. but its fail.... fail??? not really. for one or hundred reason phones rejected to accept the stock rom but also all usb feature like mouse and keyboard is back whats that, i do nothing actualy  its just weird situation , at list i know how todo if this happening in the future.