Can't access flash mode on Xperia Z3. - Xperia Z3 Q&A, Help & Troubleshooting

Hi guys. I can't access flash mode on D6603 model Z3. The phone isn't working. I can't open it with power button. When I plug into a wall charger it only bootloops the sony logo. And when I try to restore it with PC Companion I can't access flashmode. Same with flashtool. Phone isn't rooted and has offical firmware. How can I fix this? I really need help.
Edit: Replaced the battery and now it's working fine.

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[Q] Need Help in Flashing Xperia X8 E15i

Hi guys..I need help with flashing my Xperia X8.
I made some mistake in flashing the rom..and now my phone is bricked and stuck at Sony Ericson logo.
I've tried flashing my Phone with PCC and Flashtool since SEUS cant be used now..But nothing works.
Here what i've done:
FlashTool
1)Insert Xperia x8 default firmware in Flashtool/Firmware
2)After I choose My firmware I insert USB cable to my CPU,(Phone Turned Off)Press Back Button and then insert the usb cable.
3)It does not enter flash mode.No Green Light No nothing.It only entered to Sony Ericsson logo and stuck there doing nothing.Pull back the battery
and insert back and press the Back button,Insert the USB Cable to phone the problem still occur!
4)Tried all sorts of combination still the same..
PC Companion
1)Same problem with flashing since It need to press Back Button(Phone turned off)..
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[Q] How to fix xperia z3 if the lower key button during flashmode can't be detected?

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USB connection doesn't work on Xperia E3 D2202 after install CWM

Hello everyone, sorry again for my bad english
I have a "Little" problem with my Xperia E3 D2202, after unlock the bootloader, i've changed the recovery with this tutorial http://forum.xda-developers.com/xperia-e3/general/noob-friendly-root-recovery-installation-t2989689
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Xperia Z3 leaving flash mode

Hi,
I have a problem with Xperia z3. I'm trying to flash it. I'm connecting it on flashmode, but after 1 min phone is just turning on. Do You know why?
Use flashmode only when prompt to do it either by flashtools or Sony pc ccompanion. Otherwise flashmode will go off causing the behaviour you describe
Ok, thanks for advice Didn't knew about it

Sony Xperia Z3 bricked by flashing different backup

I flashed a bootloader unlocked Z3 from TWRP with a backup from another Z3 and now phone lite blinks red when plugged in to charger or computer. Phone does not stay recognized by windows. Cant boot into bootloader or recovery at all. I have tried every key combination to restart and yellow button. I tried Sony Xperia companion software as well. No luck. I am sure I have used TWRP backup from same model phone before. I am sure the backup is from same model as phone I seem to have bricked.

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