No Connection to Carrier from Pinephone 3G Model

[merlin]

OK I reflashed the Modem Firmware:

It was successfull
[034.898]: THE TOTAL DOWNLOAD TIME IS 29.555 s
[034.898]: Upgrade module successfully.

But the problem is still the same:
No connection to carrier!!!

Okt 23 09:55:44 alarm kernel: modem-power serial1-0: ===================================================
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Version: RPMR07A03_1:37500: Dec 2 2019
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Version: TZR07A03: Dec 2 2019
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Version: SBLR07EG25G01_1:37500: May 30 2
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Build Date: 2020-06-13,09:14
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Custom Name : STD
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Branch Name: 9x07_R07_NEW
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Project Rev : EG25GGBR07A08M2G_01.002.07
Okt 23 09:55:44 alarm kernel: modem-power serial1-0: Project Name: EG25G
Okt 23 09:55:43 alarm kernel: modem-power serial1-0: ===================================================

I only get this:
Okt 23 09:55:52 alarm ModemManager[3780]: <warn> [modem0] couldn't load supported assistance data types: LOC service: general failure
Okt 23 09:55:51 alarm ModemManager[3780]: <warn> [modem0] couldn't load list of own numbers: Couldn't get MSISDN: QMI protocol error (16): 'NotProvisioned'
Okt 23 09:55:51 alarm ModemManager[3780]: <warn> [modem0/sim0] couldn't load list of emergency numbers: uninitialized emergency numbers list
Okt 23 09:55:51 alarm ModemManager[3780]: <warn> [modem0/sim0] couldn't load operator name: Couldn't get home network: QMI protocol error (16): 'NotProvisioned'
Okt 23 09:55:51 alarm ModemManager[3780]: <warn> [modem0/sim0] couldn't load operator identifier: Couldn't get home network: QMI protocol error (16): 'NotProvisioned'

And if I search for the network in phosh manualy this:

Okt 23 09:57:28 alarm gnome-control-c[3945]: Error: scanning networks failed: Zeitüberschreitung wurde erreicht
Okt 23 09:57:42 alarm ModemManager[3780]: <warn> [modem0] couldn't load operator name: Current operator description is still unknown
Okt 23 09:57:42 alarm ModemManager[3780]: <warn> [modem0] couldn't load operator code: Current operator MCC/MNC is still unknown

From my side it's not an Error with the firmware.
Currently I tried 3 different SIM Cards,
and wrote the whole firmware to the modem.

I think the Modem is broken somehow.