Hi, i would suggest reading some of the articles on here about Switch JoyCon drift. You may be able to solve the issue there. Unfortuantely Nintendo doesn’t want to address a known issue with their product but the guys here at ifixit have done numerous articles and guides on nintendo switch issues

Hi Joe, Unfortunately due to the way firmware is written to electronics, if the process is stopped during the firmware update before completion then the device is ‘bricked’ as there is no firmware or a corrupted firmware on the device. Firmware updates overwrite the original firmware data during the update so stopping the update leaves you with an unusable firmware and therefore an unusable device. The best you can do is talk to Samsung support about this issue but there is unfortunately not much you can do yourself to fix the problem.