I have a china MI 8 Pro (AKA Mi UD 8 in china). The phone was bought in china with chinese ROM. It was working perfectly fine using same rom in India with Airtel 4G and Jio 4G LTE in india for 1 + year. I only installed Google play store and other apps as normal APK (without root / flashing). With recent OTA to MIUI 11.0.2 | Stable | 11.0.2.0 (QECCNXM), it stopped working on Airtel & Jio 4G lte networks. Factory reset didn't help. I tried with Vodafone 4G sim card, but at least it was detected as 3g.
Later I flashed stable global roms and Chinese stable rom to see if its an update issue. I also restored previous stable global rom V10.3.6.0 PECMIXM.
I have already tried changing preferred network types in engineering mode (#*#*4636*#*#), changing preferred network type in sim settings, resetting APN, manually adding APN, moving sim cards to different slots, etc with no luck.
When I manually search the network in only shows Vodafone 3g /2g and dolphin 3g/2g (MTNL) networks with "banned" word in the network name, with no matter which provider card I use in the mobile to while searching the networks. Same cards in another mobile K20 pro works in 4g LTE mode with full speed. So network in my area is not a problem
Phone is only bootloader unlocked state, I haven't tried any custom rom with twrp or making any changes as root. Root is not acquired yet, not planned too.
Phone is currently working 3g on only 2 providers (Vodafone) or Dolphin 3g. It's ok if Vodafone 4g/LTE works on same phone.
Any guidance/suggestions to make any progress in right direction to solve the problem are appreciated.
Later I flashed stable global roms and Chinese stable rom to see if its an update issue. I also restored previous stable global rom V10.3.6.0 PECMIXM.
I have already tried changing preferred network types in engineering mode (#*#*4636*#*#), changing preferred network type in sim settings, resetting APN, manually adding APN, moving sim cards to different slots, etc with no luck.
When I manually search the network in only shows Vodafone 3g /2g and dolphin 3g/2g (MTNL) networks with "banned" word in the network name, with no matter which provider card I use in the mobile to while searching the networks. Same cards in another mobile K20 pro works in 4g LTE mode with full speed. So network in my area is not a problem
Phone is only bootloader unlocked state, I haven't tried any custom rom with twrp or making any changes as root. Root is not acquired yet, not planned too.
Phone is currently working 3g on only 2 providers (Vodafone) or Dolphin 3g. It's ok if Vodafone 4g/LTE works on same phone.
Any guidance/suggestions to make any progress in right direction to solve the problem are appreciated.
