After lots of dead ends I finally found a solution, flash global QCN on the Chinese version of the phone.
1. Go here and go up to step 6 and STOP. Make sure you don't delete with ADB before you backup with QPST too (see step 2)
2. Go to QPST -> Start clients -> Software Download -> Backup --- Back up as QCN, this is your original is anything goes wrong.
2.5 Make sure you have your IMEI written somewhere.
3. Download QCN and XQCN + All you need for the guide , proceed with the guide until step 12 and then first restore the QCN, reboot -> restore edited XQCN, reboot
4. Enjoy LTE
5. Backup new QCN with working LTE.
Drivers:
Drivers
Alternate method:
Use RF_MV_Manager to restore IMEI directly to the QCN file, youll need to use the QPST from that thread, the other one doesn't have RF_MV_Manager.
Restore only QCN, LTE fixed.
Bonus:
Using this guide, make sure you still have band 4, original value should be 2061584302303.
vkass said:
After lots of dead ends I finally found a solution.
1. Go here and go up to step 6 and STOP. Make sure you don't delete with ADB before you backup with QPST too (see step 2)
2. Go to QPST -> Start clients -> Software Download -> Backup --- Back up twice, once as QCN and once as XQCN.
3. Download QCN and XQCN + All you need for the guide , proceed with the guide until step 12 and then first restore the QCN, reboot -> restore edited XQCN, reboot
4. Enjoy LTE
5. Backup new QCN with working LTE.
Drivers:
Drivers
Bonus:
Using this guide, make sure you still have band 4, original value should be 2061584302303.
Click to expand...
Click to collapse
Is there a QCN or XQCN with all US LTE bands unlocked yet?
LiQuiD_FeAR said:
Is there a QCN or XQCN with all US LTE bands unlocked yet?
Click to expand...
Click to collapse
I don't think there will ever be one.
You can unlock all the bands you need with http://forum.xda-developers.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774
If it doesn't work there might be a filter, which is a hardware mod.
vkass said:
I don't think there will ever be one.
You can unlock all the bands you need with http://forum.xda-developers.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774
If it doesn't work there might be a filter, which is a hardware mod.
Click to expand...
Click to collapse
I tried to set my nv memory up for AT&T and my current values look like this:
sim0
00441 : 0xFFFF
00946 : 0xBFFF
01877 : 562950069289347
02954 : 131072
06828 : 2061719111903
06829 : 2061719111903
I get 4g in Europe where i am currently but i haven't been to America to try it on at&t yet
LiQuiD_FeAR said:
I tried to set my nv memory up for AT&T and my current values look like this:
sim0
00441 : 0xFFFF
00946 : 0xBFFF
02954 : 131072
06828 : 2061719111903
06829 : 2061719111903
I get 4g in Europe where i am currently but i haven't been to America to try it on at&t yet
Click to expand...
Click to collapse
Well I guess you'll find out if it worked when you get there.
If it doesn't it's probably hardware filter.
vkass said:
After lots of dead ends I finally found a solution.
1. Go here and go up to step 6 and STOP. Make sure you don't delete with ADB before you backup with QPST too (see step 2)
2. Go to QPST -> Start clients -> Software Download -> Backup --- Back up twice, once as QCN and once as XQCN.
2.5 Make sure you have your IMEI written somewhere.
3. Download QCN and XQCN + All you need for the guide , proceed with the guide until step 12 and then first restore the QCN, reboot -> restore edited XQCN, reboot
4. Enjoy LTE
5. Backup new QCN with working LTE.
Drivers:
Drivers
Bonus:
Using this guide, make sure you still have band 4, original value should be 2061584302303.
Click to expand...
Click to collapse
if not root can't?
@aried73 must be rooted
thanks I made everything as you wrote, LTE began to catch well! but now I established android 5.1.1 AOSP, I can establish CM13 and not lose the qcn control?
I still have the following issues after following the steps:
- 4Gs network are actually detected when doing network search, but it will be 3G after we select it anyway
- setting preferred mode to LTE Only will make things worse: can't search for network
- in 2nd sim 4G works fine
any help?
Edit: actually I also want to ask: should I first restore your QCN file (80DE5873_0), unmodified? (I did). What's the difference between XQCN and QCN
Hi just wanna ask if this tutorial actually are the method to repair IMEI for anyone that have invalid or blank IMEI after flash / upgrade from custom vendor ROM?
Mine updated from custom vendor ROM MIUI7 (version 7.1.9.0.0) to MIUI7 (7.3.2) the IMEI seems ok, both SIM have different IMEI, even after flash to MIUI8 dev, for unlocking bootloader purpose, the IMEI seems valid, still only SIM2 able to lock 4G.
P/S : Currently I'm on CM13 look like the IMEI still valid and okay and yet only SIM2 can do 4G,
BTW does the method above can be apply on CM13 or just under MIUI environment?
What you're doing here is flash default global qcn file.
If you got a phone with custom firmware it's probably the Chinese version and that's why LTE doesn't work.
@salzzz yes that right first qcn then xqcn, I don't know the default imei for the qcn so can't edit it, only with alternate method I posted after.
Which ROM and radio are you using?
Make sure you use adb commands from the guide to wipe everything related to radio.
@Kirk77777 flashing Roms has not affect on qcn.
@BaTaK_iCe like I said it flashes default global qcn, it will fix any issues with radio, whether it's Lte or imei. Works with any rom.
Basically like going back to global stock.
@ vkass
hello please say why on cm13 santoshi, and other customs, lte only on 2sim slot ?
Kirk77777 said:
@ vkass
hello please say why on cm13 santoshi, and other customs, lte only on 2sim slot ?
Click to expand...
Click to collapse
It didn't work for you.
You need to follow the guide completely step by step, wiping with adb is crucial.
dd if=/dev/zero of=/dev/block/mmcblk0p13
dd if=/dev/zero of=/dev/block/mmcblk0p14
dd if=/dev/zero of=/dev/block/mmcblk0p16
reboot
Just restoring the QCN should give you LTE, but the IMEI will be different, that why you need to restore XQCN with your IMEI.
OR like I said in OP follow alternative method and edit IMEI in QCN directly.
It didn't work for you.
You need to follow the guide completely step by step, wiping with adb is crucial.
dd if=/dev/zero of=/dev/block/mmcblk0p13
dd if=/dev/zero of=/dev/block/mmcblk0p14
dd if=/dev/zero of=/dev/block/mmcblk0p16
reboot
I DO THIS, its not working to me, i`m sad ((
I have tried it again:
I can't install the QPST from alternative method link, so I followed "the guide" (restoring imei), followed that dd-fill-with-zero, restore QCN.
I managed to restore imei using QXDM, yet LTE is still not working (before & after I restore imei)
I'm on CM13 1807 by Santosh, some days ago there's a radio.zip in that thread, and I flashed it, dunno which version, but baseband shows -8976_GEN_PACK-3.53308.1.57464.1
I'm not sure about imei, too, first time I bought the phone it comes with same imei, only 1 imei on box (which matches both sim imeis),
Phone comes with 7.19 rom. forgot whether the LTE was working/not though; after I flashed global rom, I just check that LTE is detected in both SIM1/2, but only works in sim 2
salzzz said:
I have tried it again:
I can't install the QPST from alternative method link, so I followed "the guide" (restoring imei), followed that dd-fill-with-zero, restore QCN.
I managed to restore imei using QXDM, yet LTE is still not working (before & after I restore imei)
I'm on CM13 1807 by Santosh, some days ago there's a radio.zip in that thread, and I flashed it, dunno which version, but baseband shows -8976_GEN_PACK-3.53308.1.57464.1
I'm not sure about imei, too, first time I bought the phone it comes with same imei, only 1 imei on box (which matches both sim imeis),
Phone comes with 7.19 rom. forgot whether the LTE was working/not though; after I flashed global rom, I just check that LTE is detected in both SIM1/2, but only works in sim 2
Click to expand...
Click to collapse
I really don't know, maybe check phone settings at
*#*#4636#*#* and make sure it's on LTE for sim1.
As you can see it works for me, I also have same imei for both sims.
AFAIK the radio zip is for official cm, maybe backup your rom and try flashing stock MIUI just to see if it works.
hi, just wondering how come i dont get the option to use xqcn in qpst?? it only allows me to restore qcn
[edit] updated version of qpst allows xqcn.
But now I'm getting this error when i try to restore xQCN after QCN
"The ESN of the phone does not match the ESN of this file containing RF calibration data"
What should i do?
I'm also getting. "No space on device" error when i run these commands
dd if=/dev/zero of=/dev/block/mmcblk0p13
dd if=/dev/zero of=/dev/block/mmcblk0p14
dd if=/dev/zero of=/dev/block/mmcblk0p16
Need to tick "allow file esn mismatch", restore anyway.
The error doesn't really make sense as it is used to delete.
Maybe the process needs to be done on stock MIUI.
Btw do you execute them one by one?
Dimmz said:
I'm also getting. "No space on device" error when i run these commands
dd if=/dev/zero of=/dev/block/mmcblk0p13
dd if=/dev/zero of=/dev/block/mmcblk0p14
dd if=/dev/zero of=/dev/block/mmcblk0p16
Click to expand...
Click to collapse
according to this, it's just a false positive error, you can ignore it
@vkass LTE is on for sim 1 and 2 (if it isn't, it shouldn't have been detected when doing network search either)
Hopefully there'll be a solution for this soon. Btw, what's your baseband version?
Xiaomi A3 efs backup and restore tool
to backup
EFS_persist_backup_g0dsend313
to restore
EFS_persist_restore_g0dsend313
download:
http://s4.picofile.com/file/8372556150/a3_efs_tool_by_g0dsend313.rar.html
pass:6969
XDA:DevDB Information
Xiaomi A3 efs backup and restore tool, Tool/Utility for the Xiaomi Mi A3
Contributors
mlm1102003, mlm1102003
Version Information
Status: Testing
Current Stable Version: 0.0.1
Created 2019-09-16
Last Updated 2019-09-16
Exactly what requirements do you need to be able to use this tool, I mean having root and twrp, modifications to the system risk the brick
Andres88z said:
Exactly what requirements do you need to be able to use this tool, I mean having root and twrp, modifications to the system risk the brick
Click to expand...
Click to collapse
Ideally you should have TWRP and Root. Frankly, you don't really need this tool, when TWRP will backup and restore EFS without any issue.
Worst case there is also the option of using QPST, there are also many tools available on Google play for backing up you partitions as long as you have root.
For example: Partitions Backup & Restore
Need qcn of efs backup
please you can post your EFS backup or QCN file from Mi A3, i`m without signal, but IMEI ok. i search on web but i cant find file.
i allready restore full stock ROM with fastboot method, but not fix the problem. After search on web about it, i finded on XdA and mi forum a case of Redmi Note 4 identical and the only method work is the restore with QCN file. please you can post the QCN file from Mi A3?
edson29jr said:
i allready restore full stock ROM with fastboot method, but not fix the problem. After search on web about it, i finded on XdA and mi forum a case of Redmi Note 4 identical and the only method work is the restore with QCN file. please you can post the QCN file from Mi A3?
Click to expand...
Click to collapse
https://androidfilehost.com/?fid=1899786940962589872