[Xperia Z1 Q&A, Help & Troubleshooting] Dujo13309:
Hello everyone!

I may be in deep trouble. Over the past few months, my phone has been in (self-hands) service.

I have bought a Sony Xperia Z1 C6903 used with a faulty battery and faulty audio jack port.

I have ordered a new battery and new audio jack port for my phone from eBay. I feel it is worth noting that all my orders below are from eBay. Roughly 2 weeks after I have ordered the presumed "original" parts for my phone, some one in my family has 'unknowingly' stepped on to the charge cable while the phone was charging thus resulting the phone's screen to be cracked half-way.

After that rather pleasant aftermath, I placed an order for a new 'OEM' screen digitizer along with new adhesive tapes for the phone.

After receiving my items, I proceeded to apply and replace. During the old screen tear down, I have managed to tear the loudspeaker flex ribbon. After that stressful moment, I ordered an 'original' Power On/Off-Volume-Camera flex ribbon. After that, I have replaced the ribbon and applied the adhesive tapes on the phone panels.

Before the whole part replacing, my phone was running on the DstrikerZ1Kai ROM (Version SP002X) because I was unable to unlock its boot-loader. it also had the dual recovery system installed on it.

After all that nightmare, I wanted to revert the phone back to stock ROM because of the following issues:

1. The phone stopped recognizing my USB sticks. Tried all the USB-Stock mount-etc apps on play and the net. Could not get it running.

2. It was starting to get hard to charge the phone. Now I have read about these types of problems. It is said that it is related to the ROM. May be also related to the USB problems I had.

3. I wanted to flash the Kryptonian v5 Final ROM.

Now comes my current big problem.

I was using the Xperia Companion tool to revert back to stock. Everything went fine up to the point where it told me to put the phone to flash mode.

I proceeded to try to put the phone into flash mode, however, as I immediately realized, the Volume Down button did not work at all. I then quickly thought it was a software issue and not a hardware problem. I put the phone to TWRP recovery using the inbuilt dual recovery app (forgot it's precise name), and put the DstrikerZ1Kai ROM to stock, as if I have just flashed it. Of course, I have made a backup before that in case something went awry. But during the re-flash, I have received an error. I don't remember what the error was unfortunately. After that, I accidentally rebooted the phone and now all I receive is the Sony Logo.

I wanted to use the Flash Tool to re-flash an FTP, however, I can not enter Flash Mode since my Volume Down isn't working. I can enter Fast-boot Mode, but then that is it. If I use the Fastboot menu options in Flash Tool, I can get some device info, but then, that is it. I can't use the ADB option, because it says "Device must be in ADB Mode". If I put the phone on charger, I get a red light at the top.

During the phone repair, I have reinstalled my PC to Win 7 Ultimate 64-bit. I don't know if I have the correct drivers installed, to be honest.

Please help me everyone. I am totally stuck here and don't know how to proceed forward. Should I take the phone apart again and try to press the Volume Down manually and not with the buttons itself? Should I buy a new Flex ribbon.