flashtool showing different imei, imei unknown issue. - Xperia Z Q&A, Help & Troubleshooting

hi guys, i want to ask something, i am having serious issue here! my phone was running android 4.1.2 but having no imei and unknown baseband. some thread stating if i was downgrading my fw, i will be having lost imei and unknown baseband issue, but in my case, the only fw that working was just android 4.1.2, and in my country, my phone was supposedly running on android 4.3. but when i am trying to install stock fw, i got a bootloop state. i have tried different method as such using xperifirm to download stock fw and updated fw, using pcc, but still suck in bootloop.
and my another question was, when i tried to relock my bl, flashtool showing different imei for my phone.

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I'm running a Huawei P9 with a build number of L19C900B190. I am not rooted, bootloader locked. Having an insane time trying to find a way to upgrade from Marshmallow to Nougat. I can't find any other C900 firmwares, so is it impossible for me to upgrade? In my desperation I have finally resorted to opening a new thread. Which regions received the C900 firmware? I am based in Singapore.
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Hi,
Just sharing my experiences with you.. I had the same problem as you. Tried to flash C636B190 firmware from stock firmware (which is customised by Starhub I guess Cause build number is L19 C20B150 and I can't find any info for C20 build) and end up having C900B190 installed. Regardless of how many times I reflash, build number stay with C900B190 instead of C636B190. Although I had the B190 build, but fail to install Nougat update via Hisuit.
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Hi.
I have Note5 at&t and it has Bootloader.
When I was trying to flash another stock at&t firmware, I've lost my IMEI number. As I learned, in order to get back my IMEI, I have to flash my old firmware, but I didn't memorize my old firmware name. And because of the bootloader, there is no way to learn old firmware's name with the root access. I can't root my device. Is there any solution?
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hi, i have the same problem, tried to downgrade to marshmallow but got an error, i flashed stock AT&T nougat firmware and now have no imei info or baseband info, i have tried flashing n920aucu4eqk6 and n920aucu4eql1 which are the 2 latest firmware versions but still having same problem...help! please
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