[Sony Xperia 1 III] Kazler:
As mentioned in my previous post here, SBE might never update the phone to Android 13. I gathered information and found a way to update the phone to Android 13 without any issues. If anyone can't wait for the official firmware like me, you can follow this guide.

WARNING: There might be potential issues, and flashing the phone might cause data losses, so back up your important data and mentally prepare for a reset and repairing your phone to its original state.

NOT every flashing session will have 100% successfully chance, you might have some issues and you might need to reflash quite a few times, so be REALY READY and pls dont be scared and lost your cool.

Also, the auto-update function (OTA) won't work after flashing (This can't be fixed as it happens to all phone versions when you flash other firmware that is different from the original firmware, not only SBE. Still, it's not a big problem I think, since I and many people with Xperia 1 III SBE phones already lost this function even though we didn't flash other firmware, and SBE might never update to Android 13 anymore, so who cares if OTA still works or not? But if your OTA still works and you don't want to lose that function, you can wait until SBE releases official Android 13 or until they never release any update anymore.)

Things you need:

- Check and get things you need in this guide first then come back here, especially a reliable type-C cable (Make sure you can access files on your phone through your PC using the cable. Also, make sure when you move or shake your phone, the PC won't disconnect from your phone). Attach your cable to the best USB port on your PC (you can search Google to know where your PC's best USB port is; mine is USB-A 3.1 port.)

- From the Xperifirm, get:

(1): Newest AU version (SOG03) firmware; Newest Customized Global Firmware (Dual Sim) or any firmware of your choice (I choose XQ-BC72 Customized SEA); Newest SBE version (A101SO) firmware.

(2): Newest Customized Global Firmware (Dual Sim) or any firmware of your choice; Newest SBE version (A101SO) firmware.

As you can see, there are two situations (1) and (2), situation (1) is for people who want to update to Android 13 with Japan 1 sim rom, and (2) is for people who want to update to Android 13 with Global 2 sim rom (pls dont misunderstand, you can't use 2 sim because the phone only have 1 sim slot, this situation is to make 2 sim rom works on 1 sim phone, it doesn't mean you can use 2 sim after flash). I successfully updated with (1) with additional steps so I can turn off the camera sound with 1 sim Japan rom, but some people successfully updated with (2) too and needed fewer steps, so I think (2) will work well too, choose one as you wish.

Step 1: After you get all the roms needed above:

Transfer (modem X FLASH ALL.sin, oem.map, oem_other.map file from Customized Global Firmware [for turn off camera sound, you can skip if camera sound is not a problem to you]) AND (modemst 1 X FLASH ALL.sin, modemst2 X FLASH ALL.sin, oem_other X FLASH ALL.sin and oem X FLASH ALL.sin from A101SO Firmware) TO (SOG03 Firmware Folder) as situation (1).

Transfer (modemst 1 X FLASH ALL.sin, modemst2 X FLASH ALL.sin, oem_other X FLASH ALL.sin and oem X FLASH ALL.sin from A101SO Firmware) TO (Customized Global Firmware or Your choice's Firmware Folder) as situation (2).

Step 2: Follow this guide, but do step 4 before step 3, make sure cmd doesn't show up "no usb device" like in the picture of the guide. (I don't know if it's okay to do step 3 before step 4 or not, but in the past, my phone boot into a boot loop a lot by doing step 3 before step 4). Also, when I start Newflasher, I choose "yes" to keep user data, "no" to dump trim area, and "boot to the same mode" after done flashing.

Step 3: IMPORTANT, after done flashing, if everything is okay but when Newflasher syncs the phone to boot mode, the process failed (I/O overlap operation error for example), DO NOT PANIC, DO NOT TRY TO FLASH THE PHONE AGAIN AT THIS STATE. Just detach your cable, wait for your phone turn off the green light by itself (around 15-30 mins), and then turn on your phone; it should be fine at this point, and you successfully updated your phone.Check everything to make sure your phone doesn't have any issues.

If you can turn on your phone but have issues, try reflash the phone again with the rom you customized or try custom other roms.

In the backup important data part, I only transfer all my work's documents and pictures to my SD card or to PC. I'm already prepared to reset my phone and reinstall all apps again if I fail; luckily, I successfully updated my phone. Everything of my phone works well, no data lose, VoLTE, wifi, call, etc still fine. Still L1 security. Battery is also fine.

You can also follow this guide to update the phone in the future. Pls let me know if this guide useful to you. Good luck.