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Hi Gyula, Peace be upon You and Yours All.
"or reinstall the DfuSe demo." Your last words where the key.
I could revoke the device with jumper setting.
Then i saw my ignorance, i updated from NanoVNA-H_AA_20200118 to NanoVNA-H4_20200221 version.
Everything good in the End, Thanks for Your inspiration.
Thanks All.
Sincerely
** Ari **
