I found this sequence in the forum en.miui that I put below, I need help. I enter that menu but I can not save the setting change. If I select it and exit, when I return, the default one returns. Same thing if I select it and then restart. How can I save it? Thank you
"In Italy also work 3G with TIM
But only after this setting
* # * # 4636 # * # *
Sim 1 and choose LTE /TD- SCMDA / Wcdma"
Does not make sense change of these values in options 4636, because after exiting the window or rebooting the phone will return to the default settings. It has always been this way and it is on every Xiaomi phone, but some values stay until we reboot phone, but most of this values changes to default when we exit or back from settings window.
Does not make sense tips like this. MI5C in Unicom(our FDD) does not support H + and DC, you only have H and no DC, so it's no wonder you have a smaller transfer than on Redmi 3. Next time dont read stupid answers about this options.
Conclusion:
MI5C outside China support:
2G all Bands, 3G only H, FDD-LTE B1/3/7
Not support:
H+ and DC but speed 3G is very good and have good covarage same 4G have very good speed and covarage.
Not support Volte in Europe as all phone Xiaomi.
We can on volte code but this tips its not have sense because not support..
When we have 2 sim card insert to phone
One of this card(we set what card have internet sim1 or sim2)
One of this card have 4/3G and second have only 2G.
Mi5C not support b20.
Non band cant be add to modem via ota and via flash with fastboot rom because not supoort more bands.
Ota update mode ita only to fix isses, add optimization etc.
In China
Mi5C have full support TD-LTE all bands and China Mobile, full support VOLTE,
In China They dont use b20 and this is reason why non global phones dont have this band.