How To Guide Flashing a Xperia 1 iii without unlocking

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sentientcardboard

New member
Jul 17, 2017
3
0
Looking to try flashing my SOG03 to SEA Firmware. Been having issues with signal and maintaining a 4G connection as of late. Is it possible? I can't seem to find any information about it.
 

mikahramo1

New member
Jun 19, 2022
4
2
Malaysia

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.

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. 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.
Hi Forbesii

I'm planning to flash my XQ-BC72 HK/CN Rom to SEA. Did all the above steps however when I opened up newsflasher.exe and start it just close on its own. Did I missed out something? Guidance here is very much appreciated in advance. P.S newbie here
 

anmolkakkar

Senior Member
Apr 23, 2012
512
125
Delhi
Hi Forbesii

I'm planning to flash my XQ-BC72 HK/CN Rom to SEA. Did all the above steps however when I opened up newsflasher.exe and start it just close on its own. Did I missed out something? Guidance here is very much appreciated in advance. P.S newbie here
1. Make sure you have downloaded and extracted the firmware (which is usually done automatically via XperiFirm) in a folder.

2. Once you have download the NewFlasher tool, copy past ALL the files included in that tool (6-8 files) inside the firmware folder where all the files were extracted by XperiFirm.

3. Safer way (so that it doesn't closes automatically) is to open CMD (command prompt) from within the folder where you have extracted the firmware. A quick way to do so is opening the folder via Windows explorer and once in that, in the URL bar at the top, just type cmd and hit enter. It will open cmd with the location as that of your extracted firmware.

4. Follow the steps for flashing as highlighted and it should work.

Let me know if this helps.
 
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hotcakes_shinku

Senior Member
Sep 27, 2016
131
41
Xperia XZ2
Sony Xperia 1 III
Hi Forbesii

I'm planning to flash my XQ-BC72 HK/CN Rom to SEA. Did all the above steps however when I opened up newsflasher.exe and start it just close on its own. Did I missed out something? Guidance here is very much appreciated in advance. P.S newbie here
For Newflasher did you do:

OPTIONAL STEP 1:
- if you have missing flash driver just double click exe and confirm driver extraction, an exe will become available, run it and install driver.
as stated from:
maybe you do not have a flash driver.
 

mikahramo1

New member
Jun 19, 2022
4
2
Malaysia
Hi Anmolkakkar, i did all the above mentioned. Below is the screenshot.
1660234131760.png

When I pressed any key to continue in newflasher.exe it automatically closes. I'm using the stock usb type C cable from Sony.

Is there anything that i need to do at developer options or in the recovery mode?

Thanks in advance for your guidance
 

mikahramo1

New member
Jun 19, 2022
4
2
Malaysia
Hi Anmolkakkar, i did all the above mentioned. Below is the screenshot.
View attachment 5683201
When I pressed any key to continue in newflasher.exe it automatically closes. I'm using the stock usb type C cable from Sony.

Is there anything that i need to do at developer options or in the recovery mode?

Thanks in advance for your guidance
***Latest Update***

Successfully flashed it SEA firmware after 4 attempts. it works so far. Getting the VoLTE already since im in Malaysia. Special thanks anmolkakkar and Hotcakes_shinku. Missed installing the flash driver.. Hope this sort out my network drops.

Thanks again. Appreciate very much
 

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  • 10

    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.
    2
    Hi Anmolkakkar, i did all the above mentioned. Below is the screenshot.
    View attachment 5683201
    When I pressed any key to continue in newflasher.exe it automatically closes. I'm using the stock usb type C cable from Sony.

    Is there anything that i need to do at developer options or in the recovery mode?

    Thanks in advance for your guidance
    ***Latest Update***

    Successfully flashed it SEA firmware after 4 attempts. it works so far. Getting the VoLTE already since im in Malaysia. Special thanks anmolkakkar and Hotcakes_shinku. Missed installing the flash driver.. Hope this sort out my network drops.

    Thanks again. Appreciate very much
    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!