sadly asus does not seem to be providing any bios updates for the M3401 laptop. Ive been having some wierd issues and I belive they might be related to SMU bugs.
I would be awesome if someone managed to update the stock bios to latest microcode/smu.
I think that the microcodes in AGESA cannot be replaced manually, only the manufacturer can do that (another AGESA file). I tried to replace all three microcodes, but after the operation the UBU said that the BIOS file did not contain any microcodes at all.