应该是1.1.7 开始支持的，release note里面相关描述
https://docs.pingcap.com/zh/tidb-in-kubernetes/stable/release-1.1.7#新功能:~:text=新增%20Backup%20和%20Restore%20CR%20的配置项%20spec.toolImage%20来指定%20BR%20工具使用的二进制镜像，默认使用%20pingcap/br%3A%24{tikv_version}%20(%233471%2C%20%40namco1992)
看起来只能给operator升级了