BNB Chain has instructed node operators to install a mandatory software update before the Osaka/Mendel hard fork goes live on mainnet on April 28 at 02:30 UTC. Operators must upgrade to BSC v1.7.2 and remove deprecated configuration fields; developers warned that incorrect binary replacement or leaving old settings in place could cause nodes to fall out of sync during the upgrade. The upgrade is mandatory for any node that needs to remain aligned with the network. The Mendel upgrade implements BEP-652, which adopts EIP-7825’s protocol-level per-transaction gas cap of 16,777,216 gas. That protocol cap forces all nodes to reject transactions that exceed the limit, replacing the prior soft-cap approach that could be handled differently by individual operators. Osaka/Mendel bundles nine BEPs in total. BNB Chain accepted seven of 13 Ethereum Fusaka proposals — six that require a hard fork and one client-side RPC change — and declined six others because of architectural differences. The network also added two BNB Chain–specific changes via BEP-657 and BEP-648. The hard fork was first activated on testnet on March 24 at block 88,379,325; developers said the testnet phase improved block construction, large-scale transaction handling, network stability, and execution accuracy. Specifically, BEP-657 restricts when blob transactions can be included by block number, and BEP-648 aims to reduce latency and speed up finality. With the April 28 mainnet activation contingent on operators completing the required update, the notice stresses infrastructure readiness and reiterates that the update is mandatory for nodes to continue operating and staying in sync with the chain.
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