If anybody is expecting to see "daylight" through a dpf , well good luck with that.
Even a brand new unused dpf will not show daylight , its just not how they are designed or indeed work.
You should be able to see holes into the square sections which allow the flow through the DPF.
Should be able to see a brand new DPF image attached. From your image you can see that all of these sections are clearly filled in, hence why it certainly appears to be blocked.
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