LTE Band 40( Jio signal drop) issue in All AOSP based Roms,. - LeEco Le Max 2 Questions & Answers

Hi All, i am from india and using Jio sim( 4G provider in Band 3, 5, 40). In stock rom I can see the sim can able to connect All bands,. But in all AOSP based roms the sim is not able to connect to Band 40( Always very less signal). Can anybody explain this? I tried Network signal guru App to lock the sim to band 40 only,. But the band 40 itself not listing in the app,. I can able to select band(3 or 5).
Please advise is there anybody using Band 40 in AOSP roms?

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beetfarmer_dm said:
Hello,
I am using Redmi Note 3 SD version. I have used it since December 2016 with Jio(India)
It worked perfectly. Now after using it with Vodafone 4G , i faced issue with 4G and most of the time got 3G network which i thought was restricted to that carrier.
Now i switched back to Jio and 4G drops constantly in some areas where other phones work perfectly with same SIM
I unlocked Bootloader flashed old MIUI version and rooted my phone
I installed Network Guru in that
for Band 40(2300) it drops constantly with LTE RACH being Radio Link Failure and Failure at MSG2
When i lock it to BAND 5(850) it works perfectly. Can someone help me find out whats the issue? I would love to get back to using all the bands as this may prevent me from using network in some areas
Click to expand...
Click to collapse
My kenzo has the same issue with China Mobile(China).
Failure at msg2 for band 38, band 40 and band 41.
Currently, I lock it down to band 39 to get it work.
I tried another SIM card by China Unicom doesn't have this problem, it uses band 3 and works fine.
Tried to flash the original ROM and modify the NV with QTSP but didn't work.
HW Issue
tiamed said:
My kenzo has the same issue with China Mobile(China).
Failure at msg2 for band 38, band 40 and band 41.
Currently, I lock it down to band 39 to get it work.
I tried another SIM card by China Unicom doesn't have this problem, it uses band 3 and works fine.
Tried to flash the original ROM and modify the NV with QTSP but didn't work.
Click to expand...
Click to collapse
I think its an hardware issue, replacing the motherboard might be the only way

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