The S21 would not hash at first even though the fans worked, so I did a restart, swapped the Ethernet cable, and checked all the pool logins, and I chose this miner since it runs SHA-256 for Bitcoin which gives me the liquidity I want, and after reseating power leads, updating to the latest firmware, and factory resetting then re-applying pool and wallet, it came onine 42 hours after payment, stayed near 65 dB at one meter, kept temps sready