# Backwards Compatibility
 * The `ChannelManager` deserialization semantics no longer require that
   `ChannelMonitor`s be re-persisted after `(BlockHash, ChannelManager)::read`
   is called prior to normal node operation. This applies to upgraded nodes
   only *after* a startup with the old semantics completes at least once. IOW,
   you must deserialize the `ChannelManager` with upgraded LDK, persist the
   `ChannelMonitor`s then continue to normal startup once, and thereafter you
   may skip the `ChannelMonitor` persistence step.