This is exactly it. The Windows phone OSes were forward thinking. Unfortunately, especially in versions vefore 8.1, they were very very locked down. Complete se

This is exactly it. The Windows phone OSes were forward thinking. Unfortunately, especially in versions vefore 8.1, they were very very locked down. Complete secure boot was not implemented for x86 but Microsoft was very much in favor of it for non-x86, potentially at the behest of the manufacturers and their NDAs. This extended to more than just the bootloader; e.g. most people don't even know Windows Phone 7 was a real product. At some point MS realized this was hurting them, but it was too little too late.