So I finally managed to get Sierra (10.12) running on my Dell e7240 (4600u, 8gb RAM, 256 Liteon SSD) using an EFI for an e7440. It booted, graphics worked fine, WiFi and sound didn't work but I didn't expect them to. However, I tried updating to 10.12.6, and now I get a AppleACPICPU time out error and can't boot. Does anyone know what I need to install to get this laptop to update to 10.12.6 or have an EFI file they would be willing to share?
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