How to reboot modem in boot&hold mode

Sometimes my MC7421 modems get into boot&hold mode (because of consecutive resets occurring soon after power-on). How to get out from this mode without power cycling the computer?

I do it using “qmi-firmware-update” tool:
qmi-firmware-update -U -s 001:008 SWI9X50C_01.14.13.00_GENERIC_002.048_000.nvu

Updater doesn’t write the firmware because the same version is already there but at the end it reboots the modem into normal mode

How can I reboot the modem to normal mode without using the firmware-updater?

I think firmware upgrade is already a good way to bring it back to normal

What do you expect actually if firmware updater and power cycle are not preferred?