[F30Chen]

I bought a head unit with ID4 and clear the FSC and flashed it to ID6 firmware.

Import a set of proper FSC and seems A1 status is accepted. But did not see 12d in the FSC list. Plug a USB which has map and 12D FSC in the "FSC" folder to the USB port. A message "The map version in USB is newer than the head unit, would you like to upgrade it?". Select "Yes" and I supposed the files in the USB should copy to the head unit but it did not. It just returned to the man menu. Check the FSC status and see 12D shows up in the list. From this, I have A1 and 12D accepted.

The USB we used it ok as we use it to upgrade other car's NBT EVO without any issue.

advice please.

Below is my FSC ststus

AppID 161(0xA1)
UpgradeIndex 1(0x01)
SWTType SWTclassic light
FSCStatus accepted
FSCCertStatus not available

AppID 301(0x12D)
UpgradeIndex 38(0x26)
SWTType SWTclassic light
FSCStatus accepted
FSCCertStatus not available

Old FSCs in head unit are no problem!! You can keep id4 fsc and Upgrade to id5 fsc

How? I have an ECE NBT EVO and I'm trying to replace it with NA repair codes. The ID4 Nav Enabler A0 will not go away to make way for SWT long code. Every time I try to upgrade the FSC, nothing changes.

Yes id4 a0 FSC will remain active. For id5/6 you need 120fsc.
120 FSC needs to be put on USB stick and plug into evo. That's it

Really? So put it onto the root of a USB stick along with the map update files? Do I just put in the *.FSC file or the *.DER file as well?

Yes this procedure is discribed in asap Portal too.
Only fsc but you can try with der too. I always put both