Modem on Fairphone 4 (SM7225)

Hi, I'm trying to get modemmanager to work on Fairphone 4 mainline (SoC is Snapdragon 750G, sm7225)

It's a dual SIM device so when not doing anything special mmcli says "state: failed" and "failed reason: sim-missing"

After following this guide https://wiki.postmarketos.org/wiki/User:TravMurav/Dual-Sim_QMI_draft it's looking ok

fairphone-fp4:~$ YOUR_AID=A0:00:00:00:87:10:02:FF:49:FF:05:89
fairphone-fp4:~$ sudo qmicli -d qrtr://0 --uim-change-provisioning-session="slot=1,activate=yes,session-type=primary-gw-provisioning,aid=$YOUR_AID"
[qrtr://0] Successfully changed provisioning session

fairphone-fp4:~$ mmcli -m 0                                                                                                                                                                                                                                                                                                 
  -----------------------------                                                                                                                                                                                                                                                                                             
  General  |              path: /org/freedesktop/ModemManager1/Modem/0                                                                                        
           |         device id: 46e6d18484ff43e780268699ddc1ca2555ed07cc
  -----------------------------      
  Hardware |      manufacturer: QUALCOMM INCORPORATED
           |             model: 0
           | firmware revision: MPSS.HI.2.0.1.c6-00447-BITRA_GEN_PACK-1  1  [Jun 08 2021 18:00:00]
           |    carrier config: default  
           |      h/w revision: 10000   
           |      equipment id: 355870090002350
  -----------------------------                              
  System   |            device: qcom-soc
           |           drivers: ipa, qrtr
           |            plugin: qcom-soc                                                                                                                      
           |      primary port: qrtr0   
           |             ports: qrtr0 (qmi), rmnet_ipa0 (net)
  -----------------------------            
  Status   |              lock: sim-pin2
           |    unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
           |             state: disabled                     
           |       power state: off
           |    signal quality: 0% (cached)       
  -----------------------------
  Modes    |         supported: allowed: any; preferred: none       
           |           current: allowed: any; preferred: none               
  -----------------------------                      
  IP       |         supported: ipv4, ipv6, ipv4v6
  -----------------------------                                                                                                                                                                                                                                                                                             
  SIM      |  primary sim path: /org/freedesktop/ModemManager1/SIM/1
           |    sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0
           |                    slot 2: none (active)                                                                                                                                                                                                                                                                       

"state: disabled" and "power state: off" it is now. I think I'm supposed to enable the modem now with this command? But this fails:

$ sudo mmcli -m 0 -e
error: couldn't enable the modem: 'GDBus.Error:org.freedesktop.libqmi.Error.Protocol.DeviceNotReady: Couldn't set operating mode: QMI protocol error (52): 'DeviceNotReady''

Do you have an idea what is going on here?

ModemManager log (/usr/sbin/ModemManager --debug --log-level=DEBUG --log-file=modemmanager.log --log-timestamps): https://pastebin.com/raw/ebTvgxzD (edit: pastebin's a bit weird right now, mirror: https://public.z3ntu.xyz/tmp/ebTvgxzD.txt)