I have the same issue as Lorna – I can now only swap SIM1 between 3G and 4G and SIM2 is stuck on 2G, which is annoying as SIM2’s network (Three, UK) has no 2G network at all. I usually want SIM1 on 4G and only activate/swap the 4G to SIM2 when I need to use its data instead, and I can currently no longer do this 
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