In last working condition, my phone is the TMO branded device, converted to global 10.5.11 with Magisk and TWRP.
I decided to update to 10.5.12 via Local Upgrade, as I've done previously to update. The OOS update went fine but I encountered an issue when updating Magisk to 21.4. After attempting to install to inactive slot and reboot, my phone went into QualComm CrashDump mode. Attempting to boot into TWRP or the system resulted in being thrown back into CrashDump mode. I could still get to fastboot, so I booted TWRP from fastboot and was able to at least recover my device into a working state; albeit not how it should be working. I am currently on TMO ROM fresh from msm restore, 10.5.7.IN55CB, bootloader unlocked. Phone works, signal good, IMEI good, can receive texts, etc.
From that point on, no matter if I msm back to T-Mobile firmware, flash the Global fastboot ROM, factory reset, etc I'm getting an error I can't seem to find any hits on while searching.
"Unable to mount storage
E: Unable to open /system_root/system/apex
E: Unable to load apex images from system/apex"
I'm assuming I messed up my slot_b because prior to using the msm tool, if I tried to boot from slot_b it would send me to CrashDump mode while attempting to boot from slot_a directly after attempting slot_b would send me into stock recovery mode where I could do a factory reset and successfully boot into the system. After attempting a factory reset (and format data) via TWRP I then was being sent to CrashDump mode by trying to boot from either slot or trying to enter recovery mode. When first attempting to msm, holding vol+ and plugging device in would send phone to EDL mode where it would stay for a few seconds, then reboot into CrashDump Mode. I didn't think I was getting into EDL mode, but once it showed connected in the msm tool I quickly hit start and the restore process started.
While typing this, I tried to update magisk by installing to the inactive slot (which would be slot_b) and upon reboot I went straight to fastboot. I got the message included in the 2nd image attached.
I decided to update to 10.5.12 via Local Upgrade, as I've done previously to update. The OOS update went fine but I encountered an issue when updating Magisk to 21.4. After attempting to install to inactive slot and reboot, my phone went into QualComm CrashDump mode. Attempting to boot into TWRP or the system resulted in being thrown back into CrashDump mode. I could still get to fastboot, so I booted TWRP from fastboot and was able to at least recover my device into a working state; albeit not how it should be working. I am currently on TMO ROM fresh from msm restore, 10.5.7.IN55CB, bootloader unlocked. Phone works, signal good, IMEI good, can receive texts, etc.
From that point on, no matter if I msm back to T-Mobile firmware, flash the Global fastboot ROM, factory reset, etc I'm getting an error I can't seem to find any hits on while searching.
"Unable to mount storage
E: Unable to open /system_root/system/apex
E: Unable to load apex images from system/apex"
I'm assuming I messed up my slot_b because prior to using the msm tool, if I tried to boot from slot_b it would send me to CrashDump mode while attempting to boot from slot_a directly after attempting slot_b would send me into stock recovery mode where I could do a factory reset and successfully boot into the system. After attempting a factory reset (and format data) via TWRP I then was being sent to CrashDump mode by trying to boot from either slot or trying to enter recovery mode. When first attempting to msm, holding vol+ and plugging device in would send phone to EDL mode where it would stay for a few seconds, then reboot into CrashDump Mode. I didn't think I was getting into EDL mode, but once it showed connected in the msm tool I quickly hit start and the restore process started.
While typing this, I tried to update magisk by installing to the inactive slot (which would be slot_b) and upon reboot I went straight to fastboot. I got the message included in the 2nd image attached.
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