Just updated my zl to the latest firmware OTA. root is maintained

My Z button still looks new even half year..how come aluminum can be rusted?

I didn't use anything to maintain root. I rooted my ZL with Doomlord's fix two versions back and always waited for the OTA update. I didn't do anything out of the ordinary, not even back up.

What's the remote control app which came with ZL called? Uninstalled all my preinstalled apps, couldn't find it back.
Is it in Play Store?
I think it's 4 or 5 working days.
- Doubtful waterproofing with some units.
- Back glass easy to crack and expensive to repair (RM9xx).

Guys,
my ZL won't turn on, won't charge and my computer didn't detect if i connected in flash mode 
these happen after i flash to .423 firmware (for rooting process)..

i have tried several methods suggested my Xperiablog user such as:
1. plug in charger then press vol up + on button simultaneously & charge 1 hours before turn on << not working!
2. press yellow reset button (behind the sim flap) until vibrate 1 time & 3 times << not working!

can somebody help me? i don't want to lose all the info in my ZL..i have backup all things but the backup files still inside my phone memory (not memory card)