Failed Modified firmware

[Kagiri]

Hi,

Managed to modify firmware successfully, but it fails when trying to upload it the device. During the rebuild process there are some checksum fails. As below. But it still completes. How can I resolve this.

Processing header at offset 0...sorry, this file type is not supported.
checksum update(s) failed!
Processing header at offset 260...sorry, this file type is not supported.
checksum update(s) failed!
Processing header at offset 122404...sorry, this file type is not supported.
checksum update(s) failed!
Processing header at offset 236652...sorry, this file type is not supported.
checksum update(s) failed!
Processing header at offset 241316...sorry, this file type is not supported.
checksum update(s) failed!
Processing header at offset 241380...checksum(s) updated OK.
Processing header at offset 1233248...sorry, this file type is not supported.
checksum update(s) failed!
CRC(s) updated successfully.

[villagetunic]

Even after the rebuild finishes, the firmware file may still be corrupted, as shown by the checksum issues you're experiencing during firmware upload.

[Kagiri]

How does one workaround the file types not supported