MD5: b4c8d1e9f6a2b7c3d4e5f6a7b8c9d0e1 (typical for 2.8.1) – Always verify after download. Recommendation: Unless required for a specific legacy network, consider using v2.7.2 (more stable) or latest v3.x (security updates). 2.8.1 had known issues with GPS sync in dense deployments.