Build.prop Changes Doesn't Affect System Mi 4c

[ice-it]

Hello,
I'm trying to change the preferred network on my Mi4c without entering Testing Menu after every reboot to disable TD-SCDMA.

First I've tryied to change "settings put global preferred_network_mode" but it can only retain 3 values : 1,20 (gsm only), 18,20 (TD-SCDMA) and 20,20 (default TD-SCDMA).
If i change the setting from testing menu this doesnt affect the settings.db and I always get 20,20 as value.

Then I've changed my approach and I've edited the Build.prop like this

#
# System props for telephony
# Start in GSM Auto PRL for Sim1 and GSM Only for Sim2
ro.telephony.default_network=3,1
ro.ril.def.preferred.network=3,1
#
# System prop to turn on GSMLTEPhone always
telephony.lteOnCdmaDevice=0
telephony.lteOnGSMDevice=1

reboot and nothing changed, so I've tried to put all in GSM only like that

#
# System props for telephony
# Start in  GSM Only
ro.telephony.default_network=1,20
ro.ril.def.preferred.network=1,20

still no luck, reboot and wiped cache, the network is always the predefinited TD-SCDMA.

Anyone have experience in this? Thanks

 

[crok.bic]

Did you solve this? I would really like to know how to do this via build.prop - or anything else rather than setting it manually after every reboot...