[Intel] Koladweep:
Your IP1400 devices are AOSP based. That means no playstore. But you could try sideloading apps via ADB. In most cases, the firmware and software of Set-Top Boxes are tightly controlled by the manufacturer and may not have an active custom development community or custom recovery options available. The device contains digital signatures.

option1: Stick with your device default os and sideload apps via ADB... someone did this on JioFI STB(similar to yours by following this hack... this particular model was Amlogic not Arcadyan, but this hack might work on yours by some digging around https://www.xda-developers.com/how-to-unlock-jiofi-jio-stb/] This way you get to keep your remote and other accessories and wifi and bluetooth will work. There are risks to consider.

Option2 [second best?]

If you can enter the bootloader by entering recovery (in a jio set top box, same manufacturer (one of the many)as your devices- Arcadyan with Synaptics chip, it involves long pressing reset button while the device is ON.), you can install any Linux/windows os that supports your device.

I recommend Alpine Linux since it supports ARM and is targetted at routers and embedded systems.

1st thing to do is to unlock bootloader if it is locked i.e. the option isn't there in recovery to reboot to bootloader. Try enabling dev options in the about menu of the device the same way as on android phone. [But it may not be that easy if the Manufacturer has covered the default settings menu of android with a custom UI as was the case with JioFI STB in the hack provided above. Some help from a friend in college(CSE/electrical branch) for a Mango Shake or a freebie (if a device is extra) could get you help, if more digging is needed.(looking up device specific info in the right place/using a development board or specific software etc...]

Alpine Linux:

this will make your device into a linux box. 1st step is to backup your device's system image. You would use clonezilla, a tiny linux distro that is designed to run off a usb thumb drive and backup a system image to any drive (typically the thumb drive itself) Installation and usage instructions: https://clonezilla.org/clonezilla-live.php

then you would want to make a bootable usb drive of Alpine linux and install it. An internet connection is recommended in order to install windowmanager and drivers and packages. You could use a LAN Cable. Below are the links to installation instructions.

Alpine Linux

wiki.alpinelinux.org

Requirements - Alpine Linux

wiki.alpinelinux.org

https://wiki.alpinelinux.org/Installation

You can install desktop environments (too heavy) or window managers (better and lighter ) use it as a pc(low end). I have other recommendations: you could connect SSD or an external hard drive ( to the USB 3.0 port) and configure it as a personal media server to store and retrieve via SSH your photos and videos from anywhere in the world as long as it is up and connected. Of course, you may not be able to share it since the ISPs generally have usage restrictions to avoid abuse of bandwidth. You could use it as a gateway for static or even dynamic to a degree/websites within an organization (public websites would break it since the device cannot handle that much traffic but given it is a media streaming device, it can take at least up to one Gigabit per second I guess, some are even designed for 1Tbps I saw this Tbps in the jioSTB documentation attached)

https://wiki.alpinelinux.org/wiki/Gaming_on_Alpine

remember driver support may be there or not... but it is worth a try.

There are distros specifically meant to be used as media center (like lIbreELEC and CoreELEC) but I couldn't find your device listed there.

Also during this process, you may need a USB hub to play around with IP1800 since I see only a single USB port on it in the photos provided, If a keyboard works.. if in recovery mode your STB remote isn't detected, you may need other input tools: Keyboard/mouse etc, if they are detected...[😉That's the thing. we are dealing with highly customized hardware and may not be able to use it as a PC, since it wasn't designed to be used as such...but it may work]