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Z3+ doesn't boot after:
1) I switched to Ultra Stamina mode (I never used this mode before)
2) after that I fount that battery drained.
3) From that time the phone cannot boot - red led is blinking while charging.
Sony Companion doesn't help - nothing happes after connecting device to USB with volume down button (power + volume up tried).
Maybe it's worth to change battery - insert charged one. I opened back cover already - I replaced battery to new one a couple monthes before abovementioned accident.
I believe that battery is drained but capable to be charged - but how to charge it directly?
Disconnection of battery contact leads to tripple blinking while charging.
Also I have additional brain new battery.
Now I'm in trip outside USA and there is no Sony service here.