Chosen Solution
My iPhone 7 has a shorted baseband, and its draining battery even though it isn’t used (-200mA) on idle, it seems the PMU is still trying to get the baseband to work, if I remove the baseband CPU, will the iPhone boot and work normally? I use iOS 12.1.1 beta 3 for reference.
If the problem is just the baseband yes, it will boot and work even without it.