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Bluetooth crashes OP3T on newest LineageOS builds

Hi,
with the newest builds of LineageOS for the OnePlus 3T im facing similar problems like in this post here ...
https://forum.xda-developers.com/oneplus-3t/help/lineage-os-bluetooth-crashing-op3t-t3561225
This applies both for the 20/03 and the 24/03 build. When I enter the settings and go to the Bluetooth section and there enable BT, the phone becomes unresponsive for some time and then reboots. What I found out is that if I enable BT via the status bar shortcut, everything is fine and my previously connected device (gear s2) reconnects stable. But if I then enter the settings and just click on the BT section entry, same story again, phone becomes unresponsive and then reboots. I flashed the ROM and then the OOS Firmware 4.1.0. Phone is rooted with SuperSU.

Have you tried a clean flash?

not yet. just dirty flashing with wipe cache and dalvik so far. i guess I'll give it a try then.

greg1977 said:
not yet. just dirty flashing with wipe cache and dalvik so far. i guess I'll give it a try then.
Click to expand...
Click to collapse
Report back with results plz

sakumaxp said:
Report back with results plz
Click to expand...
Click to collapse
I don't know what did the trick now but this is what I was trying...
I cleaned the cache + data of the Bluetooth system app and reinstalled BusyBox, then rebooted. The problem seems to be gone, no more crashes and freezing OS. Will leave it like this for me now. Just wanted to let you know as I don't seem to be the only one with this issue.

greg1977 said:
I don't know what did the trick now but this is what I was trying...
I cleaned the cache + data of the Bluetooth system app and reinstalled BusyBox, then rebooted. The problem seems to be gone, no more crashes and freezing OS. Will leave it like this for me now. Just wanted to let you know as I don't seem to be the only one with this issue.
Click to expand...
Click to collapse
All,
just wanted to give an update on this topic and hope for a solution
As the problem was coming back I decided to go for a full wipe and clean flash of the latest LineageOS version for the OnePlus 3T from this thread here: https://forum.xda-developers.com/oneplus-3t/development/rom-lineageos-14-1-t3547024
After I restored my apps I activated Bluetooth on the device and flawlessly connected my Smartwatch, a Gear S2. All good, all fine, all working.
AFTER that, when entering Settings => Bluetooth on the OP3T, there are 2 possible scenarios:
1) No other Bluetooth devices are around and emitting, the search stops after a few seconds saying that "no other BT devices are detected" ... makes sense.
2) There are other Bluetooth devices around and emitting, and based on my experience only one device is sufficient. The search goes on and on and on, after a while the screen freezes, and then the phone warm resets.
I was able to reproduce this inside my car when I tried to connect to the car audio system and also with my Bluetooth headset. Devices turned off => scenario 1, devices turned on and ready to connect => scenario 2.
Any idea here?

Mi 8 does not turn off or reboot after some hours turned on

I'm having the same problem in all versions. After running on the phone some hours, if you try to reset or power off the phone, it doesn't turn off at all. The screen goes off but the phone is still on. It keeps working. It can be tested turning on flashlight and powering off or resetting it, the flashlight doesn't turn off. It does not turn on again until you force reset by pressing a while the power button. I think it's related to the GPS problem, after some hours the GPS stops working, and this problem also appears.

Looks like I have the same problem.

bassbounce said:
Looks like a classic rma, contact the store where u bought it and do a warranty claim.
Click to expand...
Click to collapse
I think its a firmware issue, because I'm not the only one affected by this problem. Two friends on miui 9 and me on miui 10...

Nvm got the same bug.

I've installed with miflash latest miui 10 global beta, ant the problem is still here. I've found this problem only when gps stops working

prototovsky said:
I've installed with miflash latest miui 10 global beta, ant the problem is still here. I've found this problem only when gps stops working
Click to expand...
Click to collapse
I just noticed that I have the same problem.
If I want to reboot the phone after a few hours he won't reboot and the screen stays black very annoying problem.

Same problem with last miui 10 eu

Dont have this problem on official global beta miui 8.8.7, sounds like software related issue to me rather than a hardware problem;

Yes, I think this because before unlock the bootloader and flash the miui 10 Eu i dont have this problem

Seems that this problem is fixed with the last miui 10 Eu 8.8.9

achickennugget said:
Dont have this problem on official global beta miui 8.8.7, sounds like software related issue to me rather than a hardware problem;
Click to expand...
Click to collapse
I have now this version and the problem is there again... installed with miflash. 8.8.7 is still buggy with GPS and reboot. Let's see 8.8.9...

Xiaomi.eu has noticed this problem on their latest version too: https://forum.xda-developers.com/mi-8/how-to/rom-miui-10-8-8-9-xiaomi-eu-t3827802 (see changelog)

Hello guys, I'm facing this problem too on MIUI Global Stable 9.6.4.0, I reported the issue on MIUI forum, it would be great if you could kindly confirm my bug report to obtain more attention. Thank you. http://en.miui.com/thread-3726710-1-1.html

Mic fail in call - no sound transmitted

Hello,
This has been driving me nuts. I can't be heard in normal calls, the mic picks up nothing.
I am using global 9t pro.
I have tested the hardware and the mic is working. Speakerphone works also. All roms tried present the same problem (stock, lineage, Xiaomi.eu). I have now clean flashed stock MIUI 10 and updated to 11 and problem remains.
I've read there can be sim reader problems, but speakerphone seems to work. I've read there can be audio routing problems relating to headset with mic being detected, but I can't find evidence the phone thinks there is a headset connected. I've disabled Google Assistant and the problem remains.
What puzzles me is that even after a complete clean flash of stock rom there is no improvement.
Any advice would be greatly appreciated.
Thanks

dvns said:
Hello,
This has been driving me nuts. I can't be heard in normal calls, the mic picks up nothing.
I am using global 9t pro.
I have tested the hardware and the mic is working. Speakerphone works also. All roms tried present the same problem (stock, lineage, Xiaomi.eu). I have now clean flashed stock MIUI 10 and updated to 11 and problem remains.
I've read there can be sim reader problems, but speakerphone seems to work. I've read there can be audio routing problems relating to headset with mic being detected, but I can't find evidence the phone thinks there is a headset connected. I've disabled Google Assistant and the problem remains.
What puzzles me is that even after a complete clean flash of stock rom there is no improvement.
Any advice would be greatly appreciated.
Thanks
Click to expand...
Click to collapse
Hello I had a similar problem, my autorotation and mic started to fail and I got confused, after some research it turns out if I flash MIUI 11 and go back to MIUI 10 a partition called persist gets deleted and it completely messes up your sensors and it won't get fixed regardless you flash another rom, what I did was download fastboot rom and flash it. If that doesn't fix it extract the persist.img from the rom files and flash it through TWRP and it should go back to working. Wait now that I think about it you try flash persist.img from the files and if it doesn't work then you flash the fastboot rom. Good luck

Cant Turned on WIFI/BT, Already Flashed for BT still not working

Hi , its been a year since i bought xiaomi mi 9-global rom(128GB) and all work properly.
if im not mistaken the first rom when i bought is MIUI 10 , then the last time i update if im not mistaken is around september in MIUI 12.02 for the latest security patch.
Suddenly problem occurs recently maybe around a week. where my Wifi & Bluetooth disconnected by the system and cant be turned on but it fixed it self as i restart and now its never fixed.
I already some of fixed below :
- Restart devices
- Wipe all data
- Factory reset
- Try to flash the ROM from official one MIUI 12.02
- Following some tutorials that reset bluetooth and wifi settings
- Try downgrading MIUI version to 11
but still didnt work the Wifi & Bluetooth setting always crash & cant be turned on , try CIE or CIU test found out that the proximity sensor also didn't work.
I also tried some tutorials that do in EDL mode to install persist mode but its not working due to the Authentication it says" i dont have the permission"
Is there anyway i can fixed the Bluetooth & Wifi in this device?? The Mobile Data is still working and other features still working except Proximity Sensor, WIFI, Bluetooth.
Is the only way is to let the xiaomi store fixed it?? this is my only phone so i need it alot and the office store probably going to take long since pandemic.
Please help me Xiaomi Pro's out there :crying:
Edit :
- my xiaomi account already match with the phone the proof is i can unlocked OEM using the xiaomi. But it seems i still dont have permissions to flash EDL.

ohookayy said:
Hi , its been a year since i bought xiaomi mi 9-global rom(128GB) and all work properly.
if im not mistaken the first rom when i bought is MIUI 10 , then the last time i update if im not mistaken is around september in MIUI 12.02 for the latest security patch.
Suddenly problem occurs recently maybe around a week. where my Wifi & Bluetooth disconnected by the system and cant be turned on but it fixed it self as i restart and now its never fixed.
I already some of fixed below :
- Restart devices
- Wipe all data
- Factory reset
- Try to flash the ROM from official one MIUI 12.02
- Following some tutorials that reset bluetooth and wifi settings
- Try downgrading MIUI version to 11
but still didnt work the Wifi & Bluetooth setting always crash & cant be turned on , try CIE or CIU test found out that the proximity sensor also didn't work.
I also tried some tutorials that do in EDL mode to install persist mode but its not working due to the Authentication it says" i dont have the permission"
Is there anyway i can fixed the Bluetooth & Wifi in this device?? The Mobile Data is still working and other features still working except Proximity Sensor, WIFI, Bluetooth.
Is the only way is to let the xiaomi store fixed it?? this is my only phone so i need it alot and the office store probably going to take long since pandemic.
Please help me Xiaomi Pro's out there :crying:
Edit :
- my xiaomi account already match with the phone the proof is i can unlocked OEM using the xiaomi. But it seems i still dont have permissions to flash EDL.
Click to expand...
Click to collapse
I would try to follow flashing method from xiaomi.eu
https://xiaomi.eu/community/threads/miui-12-0-stable-release.56191/

Laptapper said:
I would try to follow flashing method from xiaomi.eu
Click to expand...
Click to collapse
Im a new user so i cant post link above
Click to expand...
Click to collapse
thanks for the answers , is it save to flash using EU ROM? last time when i browsing for fix tutorials i read some forum here about redmi user if im not mistaken that get the phone locked for 30 days after using custom ROM when he tried to revert it back. do you think its save ? mine is global version

ohookayy said:
thanks for the answers , is it save to flash using EU ROM? last time when i browsing for fix tutorials i read some forum here about redmi user if im not mistaken that get the phone locked for 30 days after using custom ROM when he tried to revert it back. do you think its save ? mine is global version
Click to expand...
Click to collapse
I think it's safe as miui could be.
But be shure to follow step by step and take right rom version. If it's working you can flash original miui or custom roms.

Laptapper said:
I would try to follow flashing method from xiaomi.eu
Click to expand...
Click to collapse
Laptapper said:
I think it's safe as miui could be.
But be shure to follow step by step and take right rom version. If it's working you can flash original miui or custom roms.
Click to expand...
Click to collapse
Thanks for the suggestion, after i tried to flash to EU ROM i got new MIUI version which 12.04 , in global its 12.02. However the problem still happening or still remain unsolved. The bluetooth & wifi still cant be turned on, i tried on CIT it also not working and everytime the i try to open wifi & bluetooth settings , the settings always freeze and crash probably because it error. Is there any other solution you can provide?
Thanks

ohookayy said:
Thanks for the suggestion, after i tried to flash to EU ROM i got new MIUI version which 12.04 , in global its 12.02. However the problem still happening or still remain unsolved. The bluetooth & wifi still cant be turned on, i tried on CIT it also not working and everytime the i try to open wifi & bluetooth settings , the settings always freeze and crash probably because it error. Is there any other solution you can provide?
Thanks
Click to expand...
Click to collapse
I think, if you have done a really clean flash with formating data, that it's a hardware problem.

Laptapper said:
I think, if you have done a really clean flash with formatting data, that it's a hardware problem.
Click to expand...
Click to collapse
yes, i did i already follow the instructions & having no error at all for the ROM and other stuff except the WiFi & Bluetooth.
But for me its just really weird, my phone looks still great from outside no bend, dent, or crack it never fall as well.
The problem starts occurring by itself like the system is forcing the Bluetooth & WiFi to off then at some point the WiFi is connected but not transferring any data after restart everything fixed then its not working at all, which when i tried to turn it on it will freeze or the system not responding or off by itself.
btw appreciate your answer, i'm still waiting for other solution if possible :crying:

ohookayy said:
yes, i did i already follow the instructions & having no error at all for the ROM and other stuff except the WiFi & Bluetooth.
But for me its just really weird, my phone looks still great from outside no bend, dent, or crack it never fall as well.
The problem starts occurring by itself like the system is forcing the Bluetooth & WiFi to off then at some point the WiFi is connected but not transferring any data after restart everything fixed then its not working at all, which when i tried to turn it on it will freeze or the system not responding or off by itself.
btw appreciate your answer, i'm still waiting for other solution if possible :crying:
Click to expand...
Click to collapse
Are you shure that you've got a global version. I had nearly the same probs as I've flashed the global on my eu hardware.

Laptapper said:
Are you shure that you've got a global version. I had nearly the same probs as I've flashed the global on my eu hardware.
Click to expand...
Click to collapse
yes, the box says global ROM and the warranty as well and made in china. When i first buy it the box still sealed too but ididnt buy from the mi store.

ohookayy said:
yes, the box says global ROM and the warranty as well and made in china. When i first buy it the box still sealed too but ididnt buy from the mi store.
Click to expand...
Click to collapse
In my personal opinion there're 2 possibilities
Damaged hardware
Or
Modem Partition wrong or damaged
MODEM or RADIO - the phone's radio
Also called baseband, it is responsible for signals and on older devices may control wifi, bluetooth, and GPS (on most newer devices, these are handled by the kernel and ROM). Upgrades are country dependent and may improve or diminish battery performance, network signal strength, and roaming capability. It is also sometimes required to have a minimum Baseband version to use a ROM so that the RIL will play nice with the Baseband.
Modem firmware is a mini-OS for the cellular radio chip which has its own processor. Firmware is a general term, firmware exists for a lot of things on phone. The wireless chip for WiFi, GPS, and Bluetooth often has a firmware as can the GPU core among other things. These firmware files are usually located inside the SYSTEM or VENDOR partition. The modem firmware is special because it has its own separate Baseband Processor (BP) so the firmware is left out of the system image in its own partition.
Modem is not an Android-specific partition. It is tied to the hardware of the phone, but the kernel has a code allowing Android to interact with the hardware. But the baseband processor (BP) - which runs modem and is responsible for all communication through mobile networks e.g. call, SMS and internet - is totally isolated from Application Processor (the one we call CPU) and is not governed by Android kernel; it runs an independent RTOS.
May it helps you for getting a solution....

Laptapper said:
In my personal opinion there're 2 possibilities
Damaged hardware
Or
Modem Partition wrong or damaged
MODEM or RADIO - the phone's radio
Also called baseband, it is responsible for signals and on older devices may control wifi, bluetooth, and GPS (on most newer devices, these are handled by the kernel and ROM). Upgrades are country dependent and may improve or diminish battery performance, network signal strength, and roaming capability. It is also sometimes required to have a minimum Baseband version to use a ROM so that the RIL will play nice with the Baseband.
Modem firmware is a mini-OS for the cellular radio chip which has its own processor. Firmware is a general term, firmware exists for a lot of things on phone. The wireless chip for WiFi, GPS, and Bluetooth often has a firmware as can the GPU core among other things. These firmware files are usually located inside the SYSTEM or VENDOR partition. The modem firmware is special because it has its own separate Baseband Processor (BP) so the firmware is left out of the system image in its own partition.
Modem is not an Android-specific partition. It is tied to the hardware of the phone, but the kernel has a code allowing Android to interact with the hardware. But the baseband processor (BP) - which runs modem and is responsible for all communication through mobile networks e.g. call, SMS and internet - is totally isolated from Application Processor (the one we call CPU) and is not governed by Android kernel; it runs an independent RTOS.
May it helps you for getting a solution....
Click to expand...
Click to collapse
Thanks for the long and detailed explanation . My mobile network & GPS still work properly without any issues.
but idk if the Bluetooth & WiFi chip maybe fried inside
Maybe i just dont have any other option except to fix in mi store.
Once again thanks for the help :fingers-crossed:.

Question MI 11 Ultra- Issues post update to MIUI 14.0.1.0

Hi Everyone,
I updated the phone (OTA) to Global 14.0.1.0 a few weeks back and am facing issues from day one.
1. The phone overheats
2. The battery is drained much faster
3. The Bluetooth disconnects randomly
4. Rear display has stopped working
5. When I reboot the phone (Switch off/on) the screen is all garbled and phone freezes
I dont want to ditch the device as it is a great phone with super camera.
Requesting the experienced and learned in the forum to help in out, will be very grateful.
The phone is not rooted
MIUI Global 14.0.1.0 (TKAINXM)
Android Version 13 TKQ1.220829.002
Any solution for these issues ???? Please Help !!

indtram said:
Hi Everyone,
I updated the phone (OTA) to Global 14.0.1.0 a few weeks back and am facing issues from day one.
1. The phone overheats
2. The battery is drained much faster
3. The Bluetooth disconnects randomly
4. Rear display has stopped working
5. When I reboot the phone (Switch off/on) the screen is all garbled and phone freezes
I dont want to ditch the device as it is a great phone with super camera.
Requesting the experienced and learned in the forum to help in out, will be very grateful.
The phone is not rooted
MIUI Global 14.0.1.0 (TKAINXM)
Android Version 13 TKQ1.220829.002
Any solution for these issues ???? Please Help !!
Click to expand...
Click to collapse
You can try unlocking bootloader and installing Weekly ROM or EliteRom(which I am using).
For better battery life and overheating you can root and install undercklocking modules that are available on this forum ( I am using "SD778G Gaming" module)