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Upgrade the modem firmware of a device of the nRF91 Series with the serial number
1050993570:nrfutil 91 modem-firmware-upgrade --firmware mfw_nrf91x1_2.0.1.zip --serial-number 1050993570 -
Upgrade the modem firmware of all devices of the nRF91 Series that are connected to your computer:
nrfutil 91 modem-firmware-upgrade --firmware mfw_nrf91x1_2.0.1.zip --all-jlinks