Ursprünglicher Beitrag von: Shy ,
[br] You should be able to force it into developer mode by doing the following: use the "3 finger salute", (esc+refresh+power) and follow the steps to remove OS verification, etc. It will then restart on its own (Dont force restart!). It will likely say something like "dev mode has been blocked by administrator". Keep repeating step 1 till this works. Alternatively, replace the motherboard using another iFixIt guide. Hope this helps!