I'm using board manager URL: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/package_m5stack_index.json

It's complaining about the file size not matching.

That json file has:

"url": "https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/m5stack-2.0.6.zip",
"archiveFileName": "esp32-2.0.6.zip",
"checksum": "SHA-256:70d10c47de12589eb6439059e9dee3023a1c0192a24e581661f938093b100459",
"size": "253710193",

When I manually download that zip file, the file size and sha256 do not match.