iOS 26.4.1 and 18.7.7 are no longer being signed by Apple.
That means downgrading or restoring to either of these versions via Finder, iTunes or the Apple Devices app is no longer possible.
#iOS2641#iOS1877
iOS 18.7.8 scores in Geekbench about the same as iOS 18.7.7 for me:
Single-core: 2 points
Multi-core: -3 points
Metal: 0 points
#iOS1878#iOS1877#Speedtest
For completeness:
iOS 18.7.7 scores in Geekbench about the same as iOS 18.7.3 for me:
Single-core: -4 points
Multi-core: 3 points
Metal: -6 points
#iOS1877#iOS1873#Speedtest