Thx for detailed info about modem-update - it worked with exit code 0.
Afterwards I was able to switch a few times between sim1 and sim2.
But suddenly a switch hangs endless and either logread -f does not show anything anymore or I see endless repearting below messages (but WebUI seems still working):
...
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to get information about all PDP contexts
Tue Jan 31 21:13:46 2023 daemon.info mobifd: [gsm.modem0] APN '' isn't prepared for PDP 1, preparing it
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to set PDP 1 context
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to insert '' APN
Tue Jan 31 21:13:46 2023 daemon.info mobifd: Failed to prepare connection for "gsm.modem0". Waiting 0 seconds
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to get information about all PDP contexts
Tue Jan 31 21:13:46 2023 daemon.info mobifd: [gsm.modem0] APN '' isn't prepared for PDP 1, preparing it
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to set PDP 1 context
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to insert '' APN
Tue Jan 31 21:13:46 2023 daemon.info mobifd: Failed to prepare connection for "gsm.modem0". Waiting 0 seconds
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to get information about all PDP contexts
Tue Jan 31 21:13:46 2023 daemon.info mobifd: [gsm.modem0] APN '' isn't prepared for PDP 1, preparing it
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to set PDP 1 context
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to insert '' APN
Tue Jan 31 21:13:46 2023 daemon.info mobifd: Failed to prepare connection for "gsm.modem0". Waiting 0 seconds
Tue Jan 31 21:13:46 2023 daemon.err mobifd: [gsm.modem0] Failed to get information about all PDP contexts
Tue Jan 31 21:13:46 2023 daemon.info mobifd: [gsm.modem0] APN '' isn't prepared for PDP 1, preparing it
Tue Jan 31 21:13:47 2023 daemon.err mobifd: [gsm.modem0] Failed to set PDP 1 context
Tue Jan 31 21:13:47 2023 daemon.err mobifd: [gsm.modem0] Failed to insert '' APN
Tue Jan 31 21:13:47 2023 daemon.info mobifd: Failed to prepare connection for "gsm.modem0". Waiting 0 seconds
...
Btw: While modem-fw update I got some of these bad-block-messages, maybe this could be a/the problem?
[004.971]: <erase PAGES_PER_BLOCK="64" SECTOR_SIZE_IN_BYTES="2048" num_partition_sectors="29696" physical_partition_number="0" start_sector="120576" />[004.973]: <log value="start_sector = 120576 and num_partition_sectors =0x7400)"/>
[005.478]: <log value="Skipping: bad block 0x8b0"/>
[005.661]: <response value="ACK" />
With new modem-fw it's possible each time when a sim-switch is hanging to release again by "gsmctl --reboot".