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The order in which to upgrade the ECC21 and the CM4000 depends on the firmware version on the CM4.
If the CM4's firmware version is 10.203 or greater, then upgrade the ECC21 first, in order to avoid comms loss to the CM4. Error 504 might occur as well when trying to download to the CM4 first. See FA212757 for steps on upgrading the ECC21.
If the firmware version of the CM4 is less than 10.203, then upgrade the CM4 first via the RS485 connection, not through the ECC21. See FA237920 for steps on upgrading the CM4. Once the CM4 is upgraded then upgrade the ECC21. The reason is that the ECC21 was not a function of the CM4's firmware until 10.203.