Sharp Aquos xx 404SH Softbank Community Recognition

Hello Newbies/Experts/Hobbyists,
Recently I have acquired a Sharp Aquos xx 404SH made for the carrier Softbank. The specifications are as follows:

Model: 404SH
SIM-card amount: 1
Weight: 168 grams, Width: 79 mm
Height: 146 mm
Screen size: 5.7 inch, resolution: 1920x1080 (386 ppi)
CPU: Snapdragon 810, RAM: 3GB, ROM: 32GB
GPU: Andreno 430
Battery: 3000MAh

During the first days of usage, I had no problems with the phone until later on when I found out the problems with this phone:
- The lack of free memory from all the bloatwares that are built into the device.
- The OEM somehow had turned off 3 big Cortex A57 cores, making the device suffer in terms of performance.
- It has no (or so I thought) bootloader since I wasn't able to access to it (by using ADB or hardware keys).

After days spending time on the forums and videos online, I decided to ask for help in order to have it recognised by the community, as there are little to no support for this device even when it's considered fast for its days.
Going further into the "No bootloader" problem, I'm becoming more and more suspicious that the carrier (or the OEM) has managed to have the bootloader locked and make any kind of exposure to it impossible, let alone knowing that it's there., which means rooting this device is going to be a challenge. All I could see from the device regardless of when I tried to boot into the [fastboot] mode was: Sharp logo (powered by Android down the bottom) -> Aquos logo flashes for a few seconds and comes the Softbank logo -> OS. Going to the manufacturer's website revealed nothing much useful but several FAQs and drivers. No source code or guides whatsoever

I'm asking if there's any hope for this type of device and if there's anyone who is willing to help make this device recognised, because there are people like me who is owning or will own it and want to explore it further in the future and I also know that there have been attempts to request for this device, and also if there's anyway to root or unlock bootloader on this device it'd be helpful.

Thank you.

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