README: warn about modemst zeroing before flashing
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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README.md
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README.md
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@ -40,6 +40,17 @@ fastboot reboot
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Default login: `user` / `147147` (same as official postmarketOS images —
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Default login: `user` / `147147` (same as official postmarketOS images —
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change it). **Never re-lock the bootloader** with a custom image installed.
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change it). **Never re-lock the bootloader** with a custom image installed.
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> [!WARNING]
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> **Back up your modem's NV partitions before flashing.** Flash sessions have
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> been observed to zero `modemst1`/`modemst2` on this device, after which the
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> modem reports no IMEI and neither SIM slot answers (`no-atr-received`) —
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> including the eSIM. The profiles themselves are safe in the eUICC, but only
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> a restore of working `modemst` images brings access back; stock Android
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> re-provisions them on boot, postmarketOS cannot. Before your first flash:
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> `dd` both partitions to files from a rooted stock system (or from a running
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> pmOS: `/dev/disk/by-partlabel/modemst1` and `modemst2`) and keep them
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> forever. Restore with `dd` in the other direction, then reboot.
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## VoLTE configuration
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## VoLTE configuration
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imsd is installed but needs your carrier's P-CSCF address:
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imsd is installed but needs your carrier's P-CSCF address:
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