Yaesu FT-450D Checksum base may reset
Yaesu FT-450D reports unable to ack block 0 on upload after a full reset.
User must first download, then import CSV changes or edit manually from any previous img file, then upload.
Checksum base value has changed.
Detect the upload failure and set the alternate base value in memory image.
This allows previous img files to be uploaded.
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