Ethereum completes the final phase of the Fusaka upgrade, enhancing L2 data availability According to The Block, Ethereum has synchronized the final phase of the Fusaka upgrade, the 'Blob Parameters Only (BPO)' fork, increasing the blob limit per block to 21, further improving Layer 2 data availability. The BPO mechanism allows Ethereum to gradually adjust network parameters without relying on annual major upgrades. This mechanism helps reduce Rollup costs and supports network scalability.