In August 2019, ENN successfully commissioned China's first medium-scale spherical torus device, the EXL-50 (Xuanlong-50). By 2023, the system underwent a major upgrade to EXL-50U. The EXL-50U achieved its first plasma in January 2024 and subsequently achieved a major milestone in 2025 by generating a plasma current of one million amperes (1 MA) using hydrogen-boron fuel, the first time in the world. The toroidal field (TF) coils operated stably at 150 kA, generating 1.2 T magnetic fields, thereby validating the magnet system’s full-load capability and fulfilling all engineering design targets. This success demonstrates the feasibility of p-¹¹B plasmas in compact configurations.