Hello tinhead,
Thank you very much for the hint.
When you convert with DfuFileMgr.exe intermediate to HEX you avoid to enter a start address in case of the BIN format.
That makes it easier to add the USB device ID "DF11" to file "NanoVNA with scan and 1500MHz.dfu" from erik.
Because of the different file path, the CRC is different.
But if the byte length is equal, then it should be OK.
73, Rudi DL5FA