How To Guide Flashing a Xperia 1 iii without unlocking

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Forbesii

Member
Aug 17, 2021
23
12
Sony Xperia 1 III
i cant even get it into flash mode, have tried about 5 different cables, differnt usb ports. any suggestions as to why its not working? oem unlocking is enabled, usb debugging is enabled.
thanks
Did you plug your phone in first? Try turn off your phone, plug your phone to your pc, and then hold both the volume down button and the power button.
 

Forbesii

Member
Aug 17, 2021
23
12
Sony Xperia 1 III
Last edited:

val92

New member
Nov 30, 2017
4
0
Don’t worry if you haven’t. No data is gonna lose and there won’t be any damage on your phone. Just run the commend and flash again.
yeah i did that following the original steps, got bootloop then tried it doing that set active step after the phone was plugged in and it worked fine. thanks
 

Valemino92

New member
Oct 10, 2020
2
0
Thought I'd share my findings so far.
I successfully flashed my xq bc72 to sea firmware. I believe it was previously on hk. Didn't notice any improvement ( sitting at my desk doing speed tests ) was getting roughly 15-20mbps on 4g+ in Australia Melbourne on optus.
Also flashed tw, pretty much the exact same thing. Signal strength on all firmware was very weak sometime not even there but speed test were still running at the same speeds.
Flashed to xq bc52 UK o2 just to give a try, signal strength seems stronger and speed test show roighly 25-35mbps. Will use this through out the day to test and update. Thank you for the guide

Still can't get volte to work. 5g not sure yet as I don't normally get it at my house.
 

Valemino92

New member
Oct 10, 2020
2
0
Thought I'd share my findings so far.
I successfully flashed my xq bc72 to sea firmware. I believe it was previously on hk. Didn't notice any improvement ( sitting at my desk doing speed tests ) was getting roughly 15-20mbps on 4g+ in Australia Melbourne on optus.
Also flashed tw, pretty much the exact same thing. Signal strength on all firmware was very weak sometime not even there but speed test were still running at the same speeds.
Flashed to xq bc52 UK o2 just to give a try, signal strength seems stronger and speed test show roighly 25-35mbps. Will use this through out the day to test and update. Thank you for the guide

Still can't get volte to work. 5g not sure yet as I don't normally get it at my house.
It's a shame Sony don't sell these phones to the Australian market. This would be my ideal phone with it's slim and narrow form factor. Would be amazing if everything worked
 

afzal_m

Member
May 7, 2012
23
1
Sony Xperia 1 III
Thought I'd share my findings so far.
I successfully flashed my xq bc72 to sea firmware. I believe it was previously on hk. Didn't notice any improvement ( sitting at my desk doing speed tests ) was getting roughly 15-20mbps on 4g+ in Australia Melbourne on optus.
Also flashed tw, pretty much the exact same thing. Signal strength on all firmware was very weak sometime not even there but speed test were still running at the same speeds.
Flashed to xq bc52 UK o2 just to give a try, signal strength seems stronger and speed test show roighly 25-35mbps. Will use this through out the day to test and update. Thank you for the guide

Still can't get volte to work. 5g not sure yet as I don't normally get it at my house.
I have the XQ-BC72 too, and I believe the firmware is HK (is there a way to check which firmware it is on?), since this is an imported set which came from HK. I've had the phone for almost 2 months now, but the firmware version is still on 61.0.A.11.23. Refreshing the software update doesn't really do anything, and it made me wonder if it's due to me being in Malaysia with it's own mobile settings that's causing the phone to not get the latest firmwares after 61.0.A.11.23.

I would like to ask, if it is fine to flash the SEA firmware, and if it will cause any issues to the phone or not? I read that with version 52 of Newsflasher, my user data should be intact. Logically, there shouldn't be any issue, right?

I maybe just want a proper confirmation before I make the jump, since this will be the first time I will attempt to do this, and I hope nothing goes wrong.
 

afzal_m

Member
May 7, 2012
23
1
Sony Xperia 1 III
I initially thought my firmware was HK firmware, but upon further checking I have the China firmware. That could be the reason I didn't get any OTA updates ever since getting my phone back in October.

I have since flashed the SEA firmware, and immediately VoLTE is activated on my phone. This is what I've been looking for, and I don't mind that I won't get OTA updates anymore after this, since I can just manually flash the new firmware when it's available.

Glad I strengthen my nerves to go through with manually updating the firmware on my phone.

Also, thanks for the very helpful guide posted here.
 
Last edited:

Bofahad

Senior Member
Nov 14, 2013
509
87
I initially thought my firmware was HK firmware, but upon further checking I have the China firmware. That could be the reason I didn't get any OTA updates ever since getting my phone back in October.

I have since flashed the SEA firmware, and immediately VoLTE is activated on my phone. This is what I've been looking for, and I don't mind that I won't get OTA updates anymore after this, since I can just manually flash the new firmware when it's available.

Glad I strengthen my nerves to go through with manually updating the firmware on my phone.

Also, thanks for the very helpful guide posted here.
Did you have 5G enabled ??
 

ZayedCom

Member
Mar 22, 2013
31
7
Mosul
I have the XQ-BC72 model and I was wondering if anyone here managed to change the firmware while maintaining the OTA update capability, I'm tempted to change the firmware but I don't want to have to update the device manually each time there is a software update
 

Bofahad

Senior Member
Nov 14, 2013
509
87
I have the XQ-BC72 model and I was wondering if anyone here managed to change the firmware while maintaining the OTA update capability, I'm tempted to change the firmware but I don't want to have to update the device manually each time there is a software update
Flash HK firmware & u will get updates
 

mutilor

Member
Oct 16, 2021
19
5
I have a BC72, how can i check what version ROM (RU,HK,SEA etc) i have? I tried googling but not having much luck. or if you can link me to a post explaining

sorry for the noob question.
 

Forbesii

Member
Aug 17, 2021
23
12
Sony Xperia 1 III
I have a BC72, how can i check what version ROM (RU,HK,SEA etc) i have? I tried googling but not having much luck. or if you can link me to a post explaining

sorry for the noob question.
You can input #*#*7378423*#*# on your dialer and goto Sercive info > Software info, and you can find your software version. Chinese and Russian version would display the country name, others would display Global I think. My phone is in RU version now. I cannot remember what are Taiwan, Hong-Kong, and Southeast Asia roms like. I think you can find more info in apps like AIDA64 or device info HW.
 
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Nirvana Rules

Senior Member
Apr 29, 2010
753
194
Xiaomi Mi 11 Ultra
OnePlus 9 Pro
Question, after flashing BC72 android 12 on my BC62 I get bootloop trying to go back to BC62 because I have Verizon and I get no service. Is there a way to fix it? Or how do I enable VOLTE?
I've tried dialing *#*#VOLTE#*#* but it does nothing... So I can;t use my phone now :(
I've been searching and searching and I just can't figure it out. When I try to use Xperia Companion I get an error when I try to repair... Help!!!
 

PlatinCH

Member
Sep 16, 2008
36
5
Reflash with bc-72 android 12. I had the same issue after first flash. On 3rd or 4th flash, it worked. Be sure, start newflasher, connect then the phone in flash mode and start with the commands in newflasher.

I also tried flash back to other versions, because i thought that the new firmware doesn't work. Just retry.
 
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Top Liked Posts

  • 1
    Hi! I am thinking of flashing the XQ-BC52 firmware (European) on my 512GB Hong Kong/Global XQ-BC72 Xperia 1 III phone… but I'm feeling uneasy because a 512GB version of the European XQ-BC52 does not exist (Only 256GB available for XQ-BC52 in Europe).

    Will this cause problems? Is it safe? Which model do you have? 512GB or 256GB Hong Kong/Global?

    Thanks!
    I have the 256GB XQ-BC72 (Taiwan).
  • 1
    Hi! I am thinking of flashing the XQ-BC52 firmware (European) on my 512GB Hong Kong/Global XQ-BC72 Xperia 1 III phone… but I'm feeling uneasy because a 512GB version of the European XQ-BC52 does not exist (Only 256GB available for XQ-BC52 in Europe).

    Will this cause problems? Is it safe? Which model do you have? 512GB or 256GB Hong Kong/Global?

    Thanks!
    I have the 256GB XQ-BC72 (Taiwan).
  • 8

    Things needed:​

    1. An Xperia 1 iii (of corse)
    2. A Windows PC (I don't know if there's a Mac or Linux version, but I didn't find it)
    3. A reliable USB-C cable
    4. NewFlasher
    Download: [TOOL] Newflasher (xperia command line flasher)
    5. XperiFirm
    Download: Tool Archives - XperiFirm Tool

    !!!FIRST THING FIRST!!! BACKUP EVERYTHING IMPORTANT
    FLASHING A PHONE MAY CAUSE DATA LOSS. PLEASE MAKE SURE YOU HAVE A BACKUP OF YOUR DATA.


    1. Download and unzip the XperiFirm and select the ROM you want in the Available Firmware list and download.

    1630284680880.png
    1630284688276.png


    2. Once downloaded, unzip the NewFlasher into the ROM folder.

    Your folder should look like this:
    1630284714239.png


    3. Start a command line in the ROM folder and run "newflasher set_active:a" otherwise your phone will boot into a bootloop.

    1630284724477.png


    4. Power off your phone and plug it into your PC. Hold the volume down button and the power button until the LED turns GREEN.

    5. Now you can double click on the newflasher.exe in your ROM folder and follow the guide. You can keep user data while flashing, just pay attention on the instructions on the Newflasher.

    6. Don't disturb the flasher while it is working. Your phone will automatically turn on after the flashing is completed.



    My Xperia was purchased in China (XQ-BC72). I have tried many ROMs like Hong Kong and Taiwan versions. Recently I flashed my phone with the XQ-BC62 ROM and everything works very well (mobile data, voice calling, data roaming, dual SIM, exposure alert, etc.). However, I haven't try VoLTE because my carrier doesn't support it (SO SAD).
    I'm in Canada and my carrier is CMLink. The data icon for LTE shows 4G if you're curious.
    The DRM is not damaged that the Windvine security level is still L1 so you can still enjoy the HDR content on Netflix after flashing using this method.

    UPDATE Sept. 28, 2021

    I flashed my XQ-BC72 back. I have several issues while using the XQ-BC62 ROM.

    The US ROM doesn't include my carrier's configuration so VoLTE, VoWiFi, showing LTE instead of 4G is not working. According to other threads, T-Mobile doesn't have the configuration as well and someone mentioned only Google Fi users can get a configuration (NOT SURE).
    Actually, I didn't find any difference between the XQ-BC62 and the XQ-BC72 ROMs (I'm in Canada).


    Although the phone is working fine, the LTE is auto-disconnecting every 30 seconds, while HSPA+ doesn't have this issue. I don't think it's my carrier's problem because I bought a new Fido sim card and it's still disconnecting until I flash it back. So if your LTE works fine, please share your solution down below if you don't mind.
    I have heard that the new update 61.0.a.11.92 is enhancing the network performance. I don't know if it's because I didn't update my phone. I don't wanna "play" with my ROM since this is my daily using phone.
    Thanks to DennisDD78 who discovered that the OTA is not available if a non-native ROM is flashed, even it's all XQ-BC72. Still, if you make your OTA work, please share your solution!

    UPDATE Nov. 26, 2021

    I didn’t update the post due to the heavy university work (so sad).
    You can keep your data during flashing now by simply choose an option while flashing, as the Newflasher is up-to-date. But still please backup your important data before flashing.
    I can confirm that Gpay and android wear work perfectly after flashing, even a cross-model flashing.
    Flashing a different rom doesn’t bring any carrier feature like VoLTE and VoWiFi, see this post.
    I also tried XQ-BC62 roms again and also XQ-BC52 roms. Same issue, LTE disconnects every 10 seconds, and it brought no new features at all. I haven’t tried those Japanese roms. If you have any experience, please share.
    3
    Here are the instructions for keeping data intact while flashing firmware in Newflasher on the Xperia 1 III:

    If you only delete userdata.sin, your data partition will be corrupt and you will be forced to factory reset and lose all your data.

    To prevent this from happening, not only do you have to delete userdata.sin, but also appslog.sin, diag.sin and metadata.sin from the firmware folder as well. Found this by checking the update.xml file in the firmware folder, all required sin files to delete are listed as "<NOERASE>".

    @Forbesii feel free to edit your original post to include this important information.
    1

    Things needed:​

    1. An Xperia 1 iii (of corse)
    2. A Windows PC (I don't know if there's a Mac or Linux version, but I didn't find it)
    3. A reliable USB-C cable
    4. NewFlasher
    Download: [TOOL] Newflasher (xperia command line flasher)
    5. XperiFirm
    Download: Tool Archives - XperiFirm Tool

    !!!FIRST THING FIRST!!! BACKUP EVERYTHING IMPORTANT
    FLASHING A PHONE WILL CAUSE DATA LOSS. PLEASE MAKE SURE YOU HAVE A BACKUP OF YOUR DATA.


    1. Download and unzip the XperiFirm and select the ROM you want in the Available Firmware list and download.

    View attachment 5396817View attachment 5396819

    2. Once downloaded, unzip the NewFlasher into the ROM folder.

    Your folder should look like this:
    View attachment 5396821

    3. Start a command line in the ROM folder and run "newflasher set_active:a" otherwise your phone will boot into a bootloop.

    View attachment 5396823

    4. Power off your phone and plug it into your PC. Hold the volume down button and the power button until the LED turns GREEN.

    5. Now you can double click on the newflasher.exe in your ROM folder and follow the guide.

    6. Don't disturb the flasher while it is working. Your phone will automatically turn on after the flashing is completed.



    My Xperia was purchased in China (XQ-BC72). I have tried many ROMs like Hong Kong and Taiwan versions. Recently I flashed my phone with the XQ-BC62 ROM and everything works very well (mobile data, voice calling, data roaming, dual SIM, exposure alert, etc.). However, I haven't try VoLTE because my carrier doesn't support it (SO SAD).
    I'm in Canada and my carrier is CMLink. The data icon for LTE shows 4G if you're curious.
    The DRM is not damaged that the Windvine security level is still L1 so you can still enjoy the HDR content on Netflix after flashing using this method.
    Could you please tell me the difference between the XQ-BC62 ROM and other ROMs for example the Taiwan versions. Thanks for your reply.
    1
    Unfortunately OTA update system stops working after flashing non-native f/w, please consider this and warn others.
    Don`t know why, OTA just doesn`t work.
    Yes you remind me that I've received a software update but no ROM update. I will update my post. Thanks for telling me!
    1
    anybody flash bc72 firmware to bc52 model? is it work properly?
    You can flash BC52 firmware on BC72 models, so I would assume the other way round would work as well.