Xperia z1 stuck can't reboot

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First of all this is my first thread here, I am using a Sony xperia z1 (c6902) I would want someone to help me out, yesterday I tried unlocking the bootloader on my phone using flashtool and using the same flashtool to flash twrp here in lies the many problems
1. Every time I boot it enters twrp
2. I get an error where twrp is not able to mount /data
3. I am not able to enter flashboot
4. Neither am I seeing the Sony logo at startup
Pls guide me and help me fix this I haven't yet wiped any data so stock ROM must be there

Sony xperia z1 (c6902)
Android - 5.1.1
ROM - stock
May 2, 2016
get flashtool installed on you pc install drivers also.
download recovery

download rom
unlock bootloader take help from here
open flashtool flash the recovery .img file in fastboot mode
connect your sd card and copy the rom zip file in it
insert sd and go to recovery mode by pressing volume down and power button at the same time

you should be in recovery mode ,as you have already wiped out just, flash the update ( which you dowbloaded )

reboot and done!!!!!!
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