Hello!
I've observed that while flashing the nrf9151 modem firmware over USB it always succeeds, but over USB/IP the flashing always fails since the nrfutil tool internally times out after 20s.
In our setup we use USB/IP so either increasing the timeout or at least providing an option to increase the timeout would help our use case! 
Versions:
- nrfutil 8.2.0
- nrfutil-device 2.17.5
- J-Link DLL 9.26
$ nrfutil device program --firmware firmware/....zip --serial-number 1052098161 Error: One or more program tasks failed: * 1052098161: Timed out waiting for response from worker (Generic)
2026-10-20T13:29:03.067Z INFO nrfutil-device (version = 2.17.5, platform = x86_64-unknown-linux-gnu, classification = nrf-external)
invoked with program --firmware firmware/....zip --serial-number 1052098161 --json --log-output stdout --log-level
debug
2026-10-20T13:29:03.068Z DEBUG Worker timeout: None
2026-10-20T13:29:03.070Z INFO Opened J-Link DLL at /opt/SEGGER/JLink/libjlinkarm.so with version 9.26
2026-10-20T13:29:08.127Z DEBUG {jlink_usb_001052098161} Setting up IPC communication against the modem
self.target="nrf_probe::nrf9x_cellular_and_modem_ipc::nrf91"
2026-10-20T13:29:20.507Z INFO {jlink_usb_001052098161} -> set_ipc_and_ram_unsecure
self.target="nrf_probe::nrf9x_cellular_and_modem_ipc::nrf91"
2026-10-20T13:29:20.842Z DEBUG {jlink_usb_001052098161} Peripheral at 0x5002a000 is already set to non-secure
self.target="nrf_probe::peripherals::spu"
2026-10-20T13:29:28.139Z DEBUG Terminating worker with ID 410636
2026-10-20T13:29:32.324Z WARN Worker process seems hanged, so killing it; error: Error { error: (), total_delay: 4.18s, tries: 18 }
2026-10-20T13:29:32.414Z ERROR Worker terminated by signal 9
2026-10-20T13:29:32.414Z ERROR Error output of terminated worker:
2026-10-20T13:29:32.415Z INFO - 1052098161: Timed out waiting for response from worker (Generic)
Error: One or more program tasks failed:
* 1052098161: Timed out waiting for response from worker (Generic)
Best,
Jaagup