[Sony Xperia 1 V] Hurt Copain:
Disclaimer, you break it, you are on your own. I am a mere nerd searching for solutions for science.

1 V 5G Enable

DQ72 TESTED US T-Mobile

Hi everyone, as many know, I have been working on some efs related stuff to enable 5G support on the DQ72 model, I purchased online via wondamobile and US on tmobile here in the US.. By default with this device here in the US there is only LTE or LTE+ on this model. Utilizing qpst and efs tools, and pdc I was able to edit the efs partition to enable 5G.

Reaching speeds of 500-1.2gbps on tmobile. With each update you had to be sure to remove the 3 modem files from the xperifirm download otherwise it will overwrite the efs edits.

Throughout the last month or more i have fine tuned this and gotten it to work even better and easier. I am waiting to get my US model and conduct some testing on it to further prove or disprove and compare info. Once that is done I will share what has proved to be helpful. On my previous 1 IV and 5 IV devices i could simply flash the US firmware or modem and have the 5G working the same way as all these edits. So, as you can see the dq62 is the US model, xperifirm has it's .51 firmware. I tried flashing just the whole of it (when i mention flash i refer to newflasher v57 or latest), doing so smokes your entire modem altogether. It's ok, in this type of testing you face this a bit. So, be sure as in all modding, you know how to unbrick in all scenarios in case you do brick...

Usually with this issue you just flash the last stable firmware and remod. I was feeling exploratory, so just replaced the SEA modem files with that from the US, and flashed. After it finished, I had to go to *#*#4636#*#* and change selected bands to US (this is an always when messing with this) then I test changing the allocation to first NR, which doesn't work usually, then wait a min between any changes here it has a delay as it propogates. After verifying NR is doa as per usual, change it to NR/LTE you should see 5G kick on now. After a speed test I compare this speed vs the option of NR/LTE/GSM/WCDMA and go with the better of the two. On TMO the 2nd option is best i have learned. NR AVAILABLE should be visible to "true" now in 4636 menu. and it will say "NOT RESTRICTED".IMS service status should say registed, volte available, and UT Interface available as well. 5G is working now. Speed tests verify this.

So, while it is enabled my only gripe is inside my house i have slow data speeds, never getting higher than 100mbps. I want what i have outdoors lol. So, until i continue to work some more... my initial experience shows me yes we can edit efs and achieve the same as just replacing the US dq62 modem files in a hk, eu, or sea firmware file newflasher flash. Do this, adjust some settings i mentioned above and benefit from 5G in the US on this dq72 model.

I predict based on my previous work on 1 iv and 5 iv if you have a dq54 EU model you can simply flash the US firmware and run it as a dq62 with full 5G bands enabled. This needs tested, and then my next suggestion is once tested if it kills your modem, flash your latest stock firmware, replacing your modem files with that from dq62.

HINT-backup your working modem files from the firmware dump in another folder....there are 3 modem files.

So, to be clear:

backup your modem files

know how to use xperifirm and newflasher

download US firmware

add newflasher files

flash, if you are seeing 5G after checking any settings i referenced above you are good.

if no service, go to your previous working firmware. backup the 3 modem files safely in a diff folder

copy the 3 US modem files to your working firmware

flash.

check settings. 4636 check band info. set to us or wherever you are

try nr, nr/lte, nr/gsm/lte/wcmda

I will update this more as my work continues. Remember, never mod a phone if you cannot fix it yourself.

The long intensive instructions for editing efs will be not be added at this time as it is extremely dangerous and we can take a shortcut by simply flashing the US modems as stated. Eventually, as my research continues I may add those as well.

Lastly, this doesn't enable wifi calling or anything. Use pixel ims and shinzuku to enable that. the 5g volte does work.

Very special thanks to @munjeni without your work I would have broken like 5 Sony's by now..You are appreciated very much sir, your contributions are critical and we are thankful.

This link has proved to be wonderful, without this I would have had some more work to do.. THANK YOU:

helpful links for those who wish to learn more.....

How to Enable Volte and 5G Without Permanent Root on Xperia 5 III and 1 III

First of all, Thanks to @johndaniel, @htcmage, @gorEisberg @Forbesii @morphvale @arjun_m4 for sharing all the information and files required for this guide. FIRST THING FIRST: Data is priceless. Always backup before you modify your phone...

xdaforums.com

This man's work is amazing too, enable qcom diag mode for qpst edits THANK YOU:

Enable Qualcomm Diagnostic Mode on various UEs

and

https://band.radio/vonr -I did this too following the 1IV steps.

1 V

backup your mcfg_sw.mbn located in the following path: /vendor/firmware_mnt/IMAGE/MODEM_PR/MCFG/CONFIGS/MCFG_SW/GENERIC/NA/TMO/COMMERCIAL/mcfg_sw.mbn -after GENERIC, choose your region and carrier

I use mixplorer and copy it somewhere safe. Need root btw.