Hi Larry -
RFpro, Firmware 10KHz-1500MHz.
/g/nanovna-users/attachment/2391/1/DFU_M_10KHz.rar
ORISTO - with this release of alternate firmware, might you be able to create a new, updated guide as you did for the original F/W?
Funny you should mention;
I just added a DFU switch to my nanoVNA
to facilitate musical firmware evaluations.
Where is source for 10KHz-1500MHz version?
As with much open source activity, chaos accumulates...