Pinephone inner frame fused to motherboard?

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I think there's a clip there, similar to the ones around the edges. There was no glue, and no need to heat, when I took mine apart. If you want to remove the main board that's a tight fit too.

@wibble thanks for the info. I did try some tentative prying/pulling with a small screwdriver. I'll get a bit more physical and try again. Gluewise I thought some could have migrated from the original battery transport insulation tab, as the phone got quite hot the glue might have set harder then intended.