The document I have says "There is no firmware upgrade available for the 4200 "
Does not mean that a future release might become available and delivered over night using the enabled by default CWMP agent.
Note: Don't know what document that you have, but I do know there are two 4200 designs (early revision D240 and later revision D242) and each uses a different Firmware that isn't swappable between versions.
There are D240 and D241 Firmwares. Don't mix Part numbers with Firmware numbers and we are initially only talking about what Bell Canada supplied otherwise I can show my 4200 which is US based and has a D246 Part number......
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