Same, the first time I removed the grille to change the badge it was a nightmare with the tabs snagging. I think I slid a blunt knife underneath to help ping the tabs out, and eventually managed it without any damage. I might have also used something like gt86 spray to stop them binding but can't remember as it was so long ago. Ever since then it comes off really easily, I can remove it in about 10 seconds now, kind of push the grill inwards and slightly down I think and it pops right off, but I feel your pain. It might just need another try with patience and persistence, fingers crossed. The key might be to push down just a little rather than forcing it up?
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2005 Fiesta ST - wrote off
Newman fast road cams, Fusion Fabrications custom inlet manifold, custom exhaust