After tinkering for several hours, I reset most of the validators and summarized the process of various exchanges recovering 2FA Binance: Delete old 2FA fingerprint verification scan reset (should be the simplest) OKX: Email+SMS+face scan verification (there will be errors during the face scan stage, and after trying many times, the difficulty is second) Bitget: email+SMS+photo+recharge record screen recording+asset token verification, etc., with many processes involved