Assuming that there isn't any phone load name set at the device level. Do phones only load firmare when they are reset or do they check device default setting on the pub periodically for any changes? If they find a change do they load new image?
When you update the device loads or the load under device config that updates the SEPmac.cnf.xml which phones load, the info from FW load is there.
If the load is different from what the phone has it'll load whatever you configured there.
They only read the file upon reset.
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