I've received the mouse today installed rog armory it requested an update I accepted and through half the process I've got error in updating and rog armory asked to reconnect the mouse now it's not detected by any means plz advise

Hi since I got this board iam trying to run my gpu on 16x pcie it wont it only run at 8x done everything reseated the cpu cooler .... bios update ....cleared bios ... clean install .....tried different type of gpus .......whatever I did it wont po...