For updating using linux there is a program call dfu-util
It also runs under windows, this is my commandline
c:\work\DFU\dfu-util? -a 0 -s 0x08000000:leave -D c:\work\VNA\tinySA\build\tinySA.bin
under linux this should be something similar
remember: you can NOT brick a nanoVNA or tinySA. If the update goes wrong, worst case you have to open the housing and connect two contact while powering on and you always can try again
