Modem in failed state, not sending/receiving SMS
I have a PP Braveheart on Arch Phosh that had worked fine for almost 2 years on Verizon's CDMA network. Calls, SMS, and now even MMS worked. Occasionally the inbound SMS would get hung up, but clearing the modem cache by connecting to the modem and running 
resolved that. Recently I wrote a systemd service/timer that ran
echo "AT+CMGD=0,4" > /dev/ttyUSB2
every hour. Seems my issues have arisen since then. Now when I try to manually clear the cache it just returns
repeatedly in minicom. I tried flashing biktorgj modem firmware to "refresh" my modem, but it gets hung at
< waiting for any device >
and detects no fastboot devices.
Bus 002 Device 002: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem
So the modem is there, just not responding to me in the way I have become familiar with.

It seems maybe the modem may be the source of these SMS issues, but I'm not sure how to resolve it if its not responseive to minicom, atinout, or fastboot. Any thoughts?

sudo mmcli -m any -e
error: couldn't enable the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.WrongState: modem in failed state'
I have tried restarting eg25-manager and rebooting. How might I get out of this failed state?
Pretty much out of my depth, but pull the battery for 3 mins to make sure the modem gets a fresh start is my only suggestion.

Happened to me once my modem went into bizarre mode and mine did recover.
  • ROCKPro64 v2.1 2GB, 16Gb eMMC for rootfs, SX8200Pro 512GB NVMe for /home, HDMI video & sound, Bluetooth keyboard & mouse. Arch (5.16 kernel, Openbox desktop) for general purpose daily PC.
  • PinePhone Pro Explorer Edittion, Tow-boot on SPI, Arch/phosh on eMMC
  • PinePhone BraveHeart now v1.2b 3/32Gb, daily driver: Tow-boot with Arch/Phosh on eMMC
tried pulling the battery, still booted back up in failed state
Temporarily boot to another distro, like pmOS or Manjaro, from SDCard. See if something became messed up during an upgrade.

If that ^ doesn't work, poke around on the issue trackers for something similar. IIRC, people have "lost" their modems before and sometimes recovered them. I've found the eg25-manager and modemmanager boards to be full of helpful details.
PPv1.2a running PMOS ... almost a daily driver!
Same response in Mobian booted from sdcard. I think the issues is on the modem side. Any suggestions?
If all else fails you can look into opening the phone and jumpering pins / test points to boot the modem into EDL mode then reflashing with Qfirehose.

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