heya, as i myself is not that technically proficient enough to repair/reformat the phone by myself (not recommended, as any attempt to fix on your own will be seen as a "damage on purpose" by ASUS), i strongly suggest you to send to asus service cent...
seems like i am not the only one facing this issue. basically after system update, it stuck in infinite bootloop (logo screen only). got into format screen, but mine was worse. cannot factory reset, cannot wipe partition data.if you send it to the a...