Asus Zenfone 4 Max does not start anymore

I have quite an old mobile phone Asus Zenfone 4 Max (ZC520KL, X00HD_4) with Android 8.1.0. When starting, it asks for the schema to unlock then it restarts indefinitely, showing some recovering options (try again or restart). - I restarted with the **volume down** + **power** buttons to have further recovery options. - I have tried to wipe the cache partition before restarting, without any success. I would like to avoid wiping data as I received my new mobile phone the day of the old one's crash. I would like to recover data. If I run graphics tests, the test is failing (I have no further details). Last_logs file is showing this error: >Libc: access denied finding property ro.sf.lcd.density W:Failed to read max brightness: permission denied > >Kmsg_logs:\ /soc/qcom,cam_smmu/msm_cam_smmu_cb1: could not get #iommu-cells for soc/qcom,iommu@1e0000 Is there any way to fix this issue? Is there any hidden shell that I could run on the mobile to set the missing parameter and maybe make the mobile start? I cannot install any application as I cannot start the mobile. If not, is there any way to copy the data from the mobile to the computer? I cannot go further than the recovery menu. I would like to avoid running a factory reset not to lose data, but if I have no choice, is there any way to recover the reset data? I have no Google recovery, nor SD card in the mobile as it was not detecting it for a few months. It seems the debug mode is disabled as adb devices does not show anything. I don't know how to use fastboot correctly. **EDIT** Unfortunately, I have wiped data by running a factory reset. I think I have lost the last 2 years photos without any possible recovery. If someone could confirm or not, as I could continue hoping or not