General Caution Xperia 1 IV USA version XQ-CT62 bootloader unlock not allowed!

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Hurt Copain

Senior Member
May 6, 2022
125
562
Can I ask which provider you have? That you are getting 5g? Also which version did you buy? Thanks
T-Mobile. Also use Verizon..Both in the USA. Work fantastic. Bought the US version first. Returned. Too much money for the same device but a unlockable bootloader. That was '62. Bought a 72'. Running beautifully. Kirisakira kernel.. added aosp mods via zygisk and have some added customization.
 
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raven213

Senior Member
Apr 12, 2011
831
106
T-Mobile. Also use Verizon..Both in the USA. Work fantastic. Bought the US version first. Returned. Too much money for the same device but a unlockable bootloader. That was '62. Bought a 72'. Running beautifully. Kirisakira kernel.. added aosp mods via zygisk and have some added customization.
I also returned the US and I'm gonna buy 72 how's signal and speed for you on TMobile? Also are you able to signed up for Bravia core?
 
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Hurt Copain

Senior Member
May 6, 2022
125
562
I also returned the US and I'm gonna buy 72 how's signal and speed for you on TMobile? Also are you able to signed up for Bravia core?
Signal is great. No issues. Actually I had the same speeds on the US model, 100mbps-400 depending on the area. I have not see anything about bravia core. Will look into that and see.
 

2015Ducatimulti

Senior Member
May 3, 2010
1,010
253
coldwater,mi
Signal is great. No issues. Actually I had the same speeds on the US model, 100mbps-400 depending on the area. I have not see anything about bravia core. Will look into that and see.
That`s good, in my area we only have the 71 band for real 5G, and my CT72 would show 5G, but I could only get 20mb download, but when I had the CT62 that actually had the 71 band, I was able to have download speeds of 250mb,
 

David.k20z1

Member
Oct 21, 2020
5
0
Hi been lurking around, im on att with ct72 taiwan version purchased from ngpstore getting around 50-200mbps, the phone says 5g on top of screen but phone is not actually not connected to any NR bands that i seen. It gets speeds a bit faster than my xperia 1 ii at51 did, probably because its provisioned to 5g allowing faster lte speeds maybe?. Phones been great so far , been curious what provider does the ct62 gets actual mmWave with though or if it even connects to att NR 5G
 

s1dest3pnate

Senior Member
Jun 12, 2010
270
35
Sony Xperia 5
Signal is great. No issues. Actually I had the same speeds on the US model, 100mbps-400 depending on the area. I have not see anything about bravia core. Will look into that and see.
Hey, few questions if you don't mind.

  1. Does the Asia version (72) have bands 71 and n71? Can you confirm with an app like LTE Discovery that shows you are connected to LTE and 5G band 71?
  2. Is the phone IMS registered (*#*#4636#*#*) and do you have IMS services including VoLTE and WiFi Calling?
  3. Do you have VoNR? Set the radio to NR only in *#*#4636#*#* menu and try to make a call.
  4. Do you have VoLTE/VoNR hand off? Meaning if LTE or NR signal is weak, phone calls will seamlessly hand off back to the better signal without dropping the call?
  5. Do you know what advantages the US model would have versus the Asia model in the US? What is the Asia model firmware missing that would be in the US firmware?
Would really appreciate your time with checking these! Thank you in advance!
 

raven213

Senior Member
Apr 12, 2011
831
106
Hey, few questions if you don't mind.

  1. Does the Asia version (72) have bands 71 and n71? Can you confirm with an app like LTE Discovery that shows you are connected to LTE and 5G band 71?
  2. Is the phone IMS registered (*#*#4636#*#*) and do you have IMS services including VoLTE and WiFi Calling?
  3. Do you have VoNR? Set the radio to NR only in *#*#4636#*#* menu and try to make a call.
  4. Do you have VoLTE/VoNR hand off? Meaning if LTE or NR signal is weak, phone calls will seamlessly hand off back to the better signal without dropping the call?
  5. Do you know what advantages the US model would have versus the Asia model in the US? What is the Asia model firmware missing that would be in the US firmware?
Would really appreciate your time with checking these! Thank you in advance!
Ct72 doesn't have band b71 and b71 it has b66 and n41 and b41
Also volte works on TMobile wifi calling doesn't work for me unless if you are on Google Fi from what I was reading
If I set the radio to NR only i can't make calls also the difference between ct72 and ct62 is the bands supports ct62 has b71 and like 3 mmwaves which are 260 and 261
 
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SonicSamZ

Senior Member
Oct 10, 2010
224
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Late to the party, is the days of unlocking the bootloader through other-than-official means no longer possible?
 

igotroot

Senior Member
Dec 4, 2010
1,276
160
Ct72 doesn't have band b71 and b71 it has b66 and n41 and b41
Also volte works on TMobile wifi calling doesn't work for me unless if you are on Google Fi from what I was reading
If I set the radio to NR only i can't make calls also the difference between ct72 and ct62 is the bands supports ct63 has b71 and like 3 mmwaves which are 260 and 261
So wait .. the USA variant on Google Fi will get provisioned for Wi-Fi calling?

I received my USA variant phone last week and so far I really like the phone coming from the LG v30 Plus. Not having Wi-Fi calling while shopping is killing me.

I heard that Google fi was the solution but when I called them they asked me for the make and model of phone that I have and I even went on their website and they claim this phone is not compatible. So if you're telling me it does work on Google fi I will be signing up with them as soon as possible.
 

raven213

Senior Member
Apr 12, 2011
831
106
So wait .. the USA variant on Google Fi will get provisioned for Wi-Fi calling?

I received my USA variant phone last week and so far I really like the phone coming from the LG v30 Plus. Not having Wi-Fi calling while shopping is killing me.

I heard that Google fi was the solution but when I called them they asked me for the make and model of phone that I have and I even went on their website and they claim this phone is not compatible. So if you're telling me it does work on Google fi I will be signing up with them as soon as possible.
From what I been reading yes Google Fi works with wifi calling
 
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s1dest3pnate

Senior Member
Jun 12, 2010
270
35
Sony Xperia 5
Yeah this is my understanding too is that WiFi calling will work with Google Fi.

Love this phone. The only downsides for me are locked bootloader, no WiFi calling, no visual voicemail, and dim flashlight.
 

raven213

Senior Member
Apr 12, 2011
831
106
Yeah this is my understanding too is that WiFi calling will work with Google Fi.

Love this phone. The only downsides for me are locked bootloader, no WiFi calling, no visual voicemail, and dim flashlight.
You have US model? I bought it also but decided to returned it and buy ct72 international one because of bootloader and price difference lol
 

igotroot

Senior Member
Dec 4, 2010
1,276
160
Yeah this is my understanding too is that WiFi calling will work with Google Fi.

Love this phone. The only downsides for me are locked bootloader, no WiFi calling, no visual voicemail, and dim flashlight.
CONFIRMED. I switched to Google Fi, Wi-Fi calling works 100%.

Funny thing though, Google Fi on their website will tell you our phone is not compatible but in actuality it is 100% compatible.
 

igotroot

Senior Member
Dec 4, 2010
1,276
160

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  • 2
    Has anyone reached out to Sony and asked why the CT62 variant is bootloader locked? And if there's any plans for them to open it up in a future update?

    This seems incredibly ridiculous.
    I'm sure someone has but it's a waste of time they don't know what they are talking about.
    Sony will just say something like it's unlocked and works on all USA carriers.
    1
    It sucks, doubt we'll get any exploit-like solution to this issue either.
    Maybe the s1 unlocker tool (written about here) would work for the xq-ct62? Has anyone tested?
  • 3
    there is no "global" version, 62 for US, 72 for Asia, 54 for Europe. And some carrier versions for Japan.
    2
    Signal is great. No issues. Actually I had the same speeds on the US model, 100mbps-400 depending on the area. I have not see anything about bravia core. Will look into that and see.
    That`s good, in my area we only have the 71 band for real 5G, and my CT72 would show 5G, but I could only get 20mb download, but when I had the CT62 that actually had the 71 band, I was able to have download speeds of 250mb,
    2
    I would say to just look over the the Xperia 1 II and the process found here:


    However, I used this method found here:


    I use the second one, the process (newflasher) and any firmwares from Xperifirm software tool.

    From my observations from other phones to Sony Xperia 1's, its kind of hard to brick (not to say impossible).

    Using the Sony Companion software on PC helps you officially restore the phones software if you need to restart back to square one. I have flashes many different region phones and had no issues. People have seen hardware issues like storage space, carrier issues with the Japan firmware though.

    The one issue you may come across is that if you try to flash a region software that is older than another regions, newer software, it will not work. You may get a "Untrusted Device - Corruption" of something like that, but that's only because the firmware may be old. Reflashing the same firmware or using Sony Xperia Companion fixes that for you.

    For newer models like the X 1 III, an additional step helped when bootlooping (set active:a command) found here:


    Tried with the IV and saw no issues as well.

    As always, read on and good luck.
    2
    Has anyone reached out to Sony and asked why the CT62 variant is bootloader locked? And if there's any plans for them to open it up in a future update?

    This seems incredibly ridiculous.
    I'm sure someone has but it's a waste of time they don't know what they are talking about.
    Sony will just say something like it's unlocked and works on all USA carriers.
    2
    Oh no that's no good. I'm in ohio and typically have 5G UC on my Raven and rn on the us variant I'm pulling similar speeds. I checked bands on that international and it was only missing a lesser used one, band 41. Unless I'm mistaken..thanks for the insight though!
    this is from gsmarena, I`m not sure how accurate it is

    5G bands1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78 SA/NSA/Sub6 - Europe
    1, 2, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 71, 77, 78, 260, 261 SA/NSA/Sub6/mmWave - USA
    1, 3, 5, 7, 8, 28, 38, 40, 41, 77, 78, 79 SA/NSA/Sub6 - Asia