Hi MyGenos,
welcome to the PSR Tutorial Forum!
Regarding your Genos problem:
The error message you posted means that at least one of the mentioned ICs doesn't work correctly.
The ICs 601, 603, 605 and 606 are the four NAND Flash ICs of the second Tone Generator IC (Slave) and are located directly on the DM circuit board (= main board).
I fear that there is a hardware defect here. Then probably only a Yamaha service technician can help.
The NAND Flash ICs are available individually as spare parts. But the exchange should not be easy because the ICs are soldered directly to the circuit board. I hope that the entire DM board does not have to be replaced, because this costs around 560 euros here in Germany ...
The only thing you could do yourself would be to do a full Factory Reset (that resets all internal memory areas and deletes also all files in the User drive). This is done either with a special key combination or from the internal Test program.
I'm afraid this reset won't solve the problem. But if you still want to try, you are welcome to contact me via PM (Private Message) here in the forum to get the necessary information. (Yamaha does not want this to be posted publicly on the internet.)
P.S.
The incorrect indication of the maximum possible Voice Wave memory in the YEM is probably due to the fact that you have re-exported the instrument info file (.n27) from the Genos and re-imported it into the YEM. When exporting the .n27, the installed Voice Wave memory is queried and this could probably not be determined properly because of the defective IC(s).
If you still have an earlier Genos .n27 file, you could test-import this into the YEM again (delete the Install Target beforehand). The available Voice Wave size will then probably be displayed normally again (3072 MB). I don't think the YEM is the real problem.
Best regards,
Chris