Dual sim after marshmallow update?

Help Fairphone 2
,
16

Lorna’s trick did work for me, but I need to reboot the phone after the first step in order for it to work. So my steps are:

  1. Deactivate SIM1 I don’t want to be 4G (which has options 4G/3G only)
  2. Reboot phone
  3. SIM1 now has “2G” option! Set it to 2G and set SIM2 to 4G.
  4. Activate SIM1.
  5. Going back, can set SIM2 to 2G and SIM1 to 4G, but again it will only have 4G/3G options, so have to repeat next time I want SIM2 to be 4G.
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