Help on locked device (Sony Z4/Z3+) - General Questions and Answers

So my friend gave me this phone since he forgot the pin and the google account. The data in this phone is not important but the problem here is that:
1. Cant get to ADB because my PC is not authorized (he did enabled USB debugging though)
2. No way of unlocking the device (running on nougat), maybe brute force?
3. Apparently Emma and PC Companion doesnt work. Emma said this phone is locked. PC Companion "repair" option fails
4. Cannot boot to recovery because Sony
Note that i dont neeed the data inside. Just want to get this phone usable again, change the battery and LCD (touchscreen only works at the side) and use it.
Side note: Emma says this phone is E6553 (int'l ver) while the error code in PC Companion says SO-03G (Docomo ver) maybe because of this PC companion just gave up? Oh and also sometimes while booting it will just bootloop at the sony startup animation screen and then red light blinking 3 times.
help me pls

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Hey, i want to ask you guys for help me with my E6633, i boot my phone, run camera - lag - 3buttos and force down, after that i restore twrp backup, boot up phone - next lag - force down again and game over. Cant turn on, phone no react for vibrations with 3x button combo and if i connect phone Flashtool tell me USB connectet with USB Debug Off nothing more can to do..
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BL unlocked
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using Win7 64bit
USB 2.0 & 3.0 tried but not different
trying Original Sony USB Cable & one universal by Nokia both work the same..
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Best regards
Same problem here
I have the same problem, i've dissarm the whole phone, charge the battery and nothing. my phone died after a massive notifications then get a black screen and after that reboot with the Sony logo, and after that dead, not working, but the pc is detecting it.

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