[Help] Lost IMEI after update to , and downgrade

[barc]

Well, received my Sony Xperia Z Ultra C6833 a couple of days ago.
Received a notice on the OTA, upgraded to 14.1.B.2.257
I encountered random restart issues whenever Wifi is activated, so I thought, fine.

I finally have access to my computer, installed the PC companion, it prompt me with a new 14.2.A.0.290 update.

Again, I updated my phone, hoping it'll fix the Wifi problem.

After restarting, I did a test, as usual. Wifi problem persists, and what's worse, a new problem. Wifi and Playstation 3 SixAxis controller connected using bluetooth didn't play nice, caused my phone to reboot.

I know a lot of people downgraded the firmware back to the previous version, with NAN backups etc.
And some even managed to restore their IMEI back to normal.

But for my case, I haven't root my phone, attempt to downgrade it using Flashtool, lost my IMEI.

Seems that I have no choice, but to return it back to 14.2.A.0.290 praying that it works, and I still can't see my IMEI.

No, I don't have a NAN backup. That's the part which gave me a headache. I've messed around with HTC one X (a year ago), never had this problem problem before, and it's something new I've learnt from you guys today.

Tried cyangenmod's boot.img, doesn't do me any good.

Anyone managed to recover their IMEI here?
Otherwise I might have to get it back to the dealer for a replacement.

Update: Thanks to krabappel2548's guide, I've managed to flash it to 14.2.A.0.290 again and got my IMEI back, but SixAxis still won't play nice with Wifi, and the problem with random reboots while Wifi is ON still persists.

 

[dyepnoodle]

we have the same issue, mine happened during the old update, after ota wifi gets stuck, wont turn on and reboots the device. upto now its still not fixed. 3 updates have passed and still the issue persist. hope you find a fix it will help me too. tried everything from downgrading, flashing custom rom,kernel, upgrade, unlock, relock but still cant fix it

 

[barc]

I guess i'm not the only one then. I can live with the wifi issue for the time being as long as i stick to using data. But i fear it's going to affect tethering should i need that.

 

[nopponm]

Please take a look at this post, it may help you. --> http://forum.xda-developers.com/showthread.php?t=2573349

 

[barc]

Please take a look at this post, it may help you. --> http://forum.xda-developers.com/showthread.php?t=2573349

Read it the moment I discovered that my IMEI is missing.
I tried reflashing excluding the baseband, doesn't work for me, right after i realized i have a missing IMEI.

Read up on the android emulator, but haven't tried it, as my computer is kinda old, took forever to run it. Will try it once I get my hands on a faster computer

 

[barc]

Bah. Crashed when I tried to use my qx100 which i've just received. Haha. Anyone else has any fun with qx100 and z ultra combo? The Z ultra almost reminds me of my ex-girlfriend.

Meanwhile, I can't wait for kit Kat, and hope they really squash these bugs

 

[LordManhattan]

The best thing would be to contact Sony and make them aware of this bug. Losing your IMEI by simply updating should never happen and it's quite a serious bug.

 

[barc]

Actually i lost it after downgrading. Downgrade is simply because of phone keeps rebooting after I turn Wifi on.

 

[abuihsan]

The best thing would be to contact Sony and make them aware of this bug. Losing your IMEI by simply updating should never happen and it's quite a serious bug.

let's hope this is the answer : p
New build 14.2.A.1.114

 

[barc]

let's hope this is the answer : p
New build 14.2.A.1.114

I certainly hope so too.
Hope it fixes the rebooting issue with WiFi enabled.

Or the Google Play Edition port if it does fix the problem too

 

[barc]

Anyone tested the new update yet? Does it fix the wifi issues with crashing/rebooting?

 

[protostar13]

ok so i purchased my phone on amazon and got it somewhere around feb 25th, i got a message on the phone to update software so naturally i did, then i discovered what rooting does and i decided to follow some youtube instructions to flash my phone to an earlier firmware the link wasnt working so i found another which was C6802_14.1.B.0.475_GENERIC Hong Kong.ftf after flashing this i lost my imei its all zeros and i then tried flashing C6802_14.1.B.1.526_M3dD0g.ftf with no luck so im trying to find out what the updated software was that i must have downloaded when i first got the phone given the date i had recieved it im thinking that the 14.2.A.1.142 is the correct one that i must have updated to, i was running version 4.3 jelly bean before all this happened i also have this problem where everytime i turn off the phone and turn it back on it is in the chinese writing again and asks me to select my language again anyone know what to do short of return the phone while i still got time my internet is extremely slow im tired of it taking 4 hours to load a new ftf just to find out its not the right one ive heard some where hving success with the 290 getting their imei back but im thinking thats the software they started with or updated to to get it back so i have no idea which one i started with or which one i updated to all i know is the date i got it and that possibly its the 14.2.A.1.142 looks really familiar im downloading that one now so we will see what happens and i also read something about flashing excluding the basebands so if that is part of it please make it as clear as possible im obviously a noob but im learning quick

 

[blueether]

Pleas dont ask the same question in multiple threads.

See my reply to the other thread you necromanced