After reading the option "01", seems that you dfu file should be written into target option "00" (internal flash 64 sectors).
A 2nd point: NanoVNA v0.8.4.6 Xtail 25997748.dfu is 82 Ko but the uploaded file from my NanoVNA is 129 Ko , is this ok ?
Rudi
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Le 23.05.2020 ¨¤ 10:43, DiSlord a ¨¦crit?:
Try this firmware, just quick build vs XTALFREQ 25997748
