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host_probe derived the guest's below-4G split (vmie `low`) by taking the first GPA-0 RAM run in `info mtree -f`. When low RAM is fragmented by overlay pages (Hyper-V SynIC) and blackhole holes (smbase/tseg), that first run is a tiny fragment, so the split came out far too small and host_bootstrap could never recover the System DTB — the memctx context was never published. Extract a pure parser, mtree_low_split(): anchor on the system flatview, take `low` from the @file-offset of the high-RAM region at GPA >= 4 GiB (which equals the split by construction), cross-validate against the PCI-hole base, and fail closed when it can't be derived. QMP-reply un-escaping moves to the transport boundary so the parser works on plain text. Unit-tested against a synthetic fragmented flatview including a decoy non-system address space. postinst also hints to restart the daemon after an upgrade (a running instance keeps the old build until restarted). Bump 0.3.6.