Imei unknown xperia z + baseband unknown

[Leo230]

How to fix Xperia z imei and baseband problem locked bootloader and at 4.1.2 firmware 10.1.A.1.434, no root
Does anybody have a clue about whats going on ?

I was on 4.3, then after my battery ran out i connected to the charger and turned on - said updating nfc then it reboot and stuck on lock screen,reboot ,I downgraded to 4.1.2 via flashtool and got the problem of -no sim card inserted , no wifi , no imei , unknown baseband version.
What can i do? 

p.s : i read that somebody fixed it by flashing the  inital stock rom on it 

Can i find the initial one : c6003 Made in Malaysia Si 1257-5188.3 EN,ZH   S/N: BH902HD62T

[Thommo]

Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP