This phone T21P E2 can be added to the YMCS but needs special firmware 52.84.200.3
Below is the shared drive link for these files.
Upgrade steps to each major firmware version, then to 52.84.200.3
52.80.x.x <to> 52.81.x.x., etc.
https://drive.google.com/drive/folders/1J2lAHp26sg0AK-Ka_Foy4yMaXQJX3KZs?usp=sharing
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